Fertility & birth rates in Brunei and Sierra Leone

Fertility rate in Brunei vs Sierra Leone chart

According to the latest available data on birth rates, the fertility rate in Brunei was 1.75 children per woman in 2023, compared to 3.79 in Sierra Leone in 2023. The replacement level is considered to be 2.1 children per woman.

Check Brunei vs Sierra Leone population clock for a dynamic visualization of the changing population.

The chart below showcases historical changes in the birth rates.

Table

Year	Fertility rate
	Brunei	Sierra Leone
1960	7.32	6.18
1961	7.19	6.21
1962	7.03	6.22
1963	6.89	6.26
1964	6.77	6.29
1965	6.65	6.31
1966	6.51	6.35
1967	6.37	6.38
1968	6.2	6.39
1969	6.01	6.39
1970	5.8	6.41
1971	5.62	6.43
1972	5.5	6.45
1973	5.36	6.47
1974	5.18	6.53
1975	4.99	6.55
1976	4.78	6.55
1977	4.58	6.57
1978	4.39	6.59
1979	4.22	6.58
1980	4.07	6.56
1981	3.94	6.55
1982	3.84	6.56
1983	3.75	6.57
1984	3.68	6.59
1985	3.61	6.59
1986	3.55	6.6
1987	3.49	6.61
1988	3.44	6.59
1989	3.36	6.57
1990	3.29	6.57
1991	3.21	6.55
1992	3.11	6.56
1993	3.01	6.57
1994	2.9	6.56
1995	2.79	6.56
1996	2.68	6.55
1997	2.6	6.53
1998	2.53	6.5
1999	2.46	6.42
2000	2.4	6.36
2001	2.34	6.31
2002	2.26	6.23
2003	2.19	6.09
2004	2.1	5.92
2005	2.02	5.81
2006	1.97	5.74
2007	1.93	5.64
2008	1.92	5.56
2009	1.92	5.45
2010	1.94	5.33
2011	1.96	5.21
2012	1.97	5.06
2013	1.98	4.87
2014	1.97	4.7
2015	1.95	4.55
2016	1.92	4.47
2017	1.88	4.39
2018	1.85	4.29
2019	1.82	4.19
2020	1.8	4.08
2021	1.78	3.98
2022	1.76	3.88
2023	1.75	3.79
2024	1.73	3.7
2025	1.71	3.61
2026	1.7	3.53
2027	1.68	3.47
2028	1.68	3.37
2029	1.67	3.3
2030	1.66	3.23
2031	1.65	3.18
2032	1.65	3.12
2033	1.65	3.07
2034	1.64	3.02
2035	1.64	2.97
2036	1.64	2.92
2037	1.64	2.88
2038	1.64	2.84
2039	1.63	2.79
2040	1.63	2.76
2041	1.63	2.72
2042	1.63	2.68
2043	1.62	2.65
2044	1.62	2.62
2045	1.62	2.58
2046	1.62	2.55
2047	1.62	2.53
2048	1.62	2.5
2049	1.62	2.47
2050	1.61	2.45

Children 0-14 years as share of population

Table

Year	Share of people 0-14 years old
	Brunei	Sierra Leone
1960	44.1%	38.2%
1961	45.2%	38.3%
1962	46.1%	38.3%
1963	46.6%	38.5%
1964	46.6%	38.8%
1965	46.5%	39.1%
1966	46%	39.4%
1967	45.4%	39.6%
1968	44.8%	39.9%
1969	44.2%	40.1%
1970	43.6%	40.3%
1971	43.3%	40.6%
1972	43%	40.7%
1973	42.6%	40.9%
1974	42%	41.1%
1975	41.3%	41.3%
1976	40.6%	41.4%
1977	39.9%	41.6%
1978	39.3%	41.7%
1979	38.9%	41.8%
1980	38.5%	41.9%
1981	38.1%	42%
1982	37.6%	42.1%
1983	36.9%	42.2%
1984	36.3%	42.3%
1985	35.7%	42.5%
1986	35.2%	42.6%
1987	34.9%	42.7%
1988	34.7%	42.8%
1989	34.6%	42.9%
1990	34.4%	42.9%
1991	34.4%	43%
1992	34.3%	43.1%
1993	34.1%	43.2%
1994	33.7%	43.3%
1995	33.3%	43.4%
1996	32.7%	43.5%
1997	32.2%	43.5%
1998	31.6%	43.6%
1999	31%	43.7%
2000	30.3%	43.8%
2001	29.6%	43.9%
2002	28.9%	43.9%
2003	28.1%	43.9%
2004	27.4%	43.9%
2005	26.7%	43.8%
2006	25.9%	43.7%
2007	25.5%	43.6%
2008	25.5%	43.5%
2009	25.4%	43.4%
2010	25.3%	43.2%
2011	25.2%	43%
2012	24.9%	42.8%
2013	24.5%	42.5%
2014	24%	42.2%
2015	23.6%	41.8%
2016	23.1%	41.4%
2017	22.7%	41%
2018	22.3%	40.6%
2019	21.9%	40.2%
2020	21.6%	39.8%
2021	21.3%	39.4%
2022	21.2%	39%
2023	21%	38.5%
2024	20.8%	38.1%
2025	20.6%	37.7%
2026	20.4%	37.2%
2027	20.1%	36.8%
2028	19.8%	36.3%
2029	19.5%	35.9%
2030	19.1%	35.5%
2031	18.8%	35.2%
2032	18.5%	34.8%
2033	18.2%	34.4%
2034	18%	34%
2035	17.7%	33.6%
2036	17.5%	33.2%
2037	17.2%	32.8%
2038	17%	32.4%
2039	16.8%	32%
2040	16.6%	31.6%
2041	16.4%	31.2%
2042	16.3%	30.9%
2043	16.1%	30.5%
2044	16%	30.2%
2045	15.9%	29.8%
2046	15.8%	29.5%
2047	15.7%	29.2%
2048	15.7%	28.8%
2049	15.6%	28.5%
2050	15.6%	28.2%

Children aged 0-14 make up 20.8% of the population in Brunei and 38.1% in Sierra Leone in 2024, compared to 34.4% and 42.9% respectively in 1990.

Demographics of Brunei and Sierra Leone compared.

Natural population change in Brunei vs Sierra Leone by year

For the past 10 years, the annual natural population change (excluding migration) has been +1.01% in Brunei and +2.31% in Sierra Leone. The chart below illustrates the comparison of the absolute yearly changes resulting from births and deaths.

Table

Year	Population change due to births and deaths
	Brunei	Sierra Leone
1960	3,168	38,192
1961	3,175	40,022
1962	3,128	41,603
1963	3,195	43,569
1964	3,264	45,487
1965	3,326	47,223
1966	3,403	49,486
1967	3,477	51,734
1968	3,551	53,126
1969	3,618	54,768
1970	3,694	56,513
1971	3,880	58,484
1972	4,085	60,279
1973	4,216	62,443
1974	4,334	65,357
1975	4,431	67,560
1976	4,518	69,506
1977	4,594	71,663
1978	4,668	74,130
1979	4,717	75,992
1980	4,775	77,932
1981	4,839	80,111
1982	4,931	82,457
1983	5,138	84,628
1984	5,373	87,072
1985	5,620	88,869
1986	5,826	90,902
1987	6,017	94,235
1988	6,135	96,344
1989	6,202	98,298
1990	6,265	100,778
1991	6,259	105,477
1992	6,169	103,251
1993	6,045	103,317
1994	5,907	101,486
1995	5,750	100,885
1996	5,606	104,140
1997	5,518	105,433
1998	5,466	103,906
1999	5,388	102,295
2000	5,331	110,754
2001	5,275	116,647
2002	5,169	126,429
2003	5,034	130,312
2004	4,874	132,661
2005	4,703	137,234
2006	4,590	144,127
2007	4,521	145,740
2008	4,624	149,855
2009	4,789	152,669
2010	5,003	155,338
2011	5,242	158,858
2012	5,349	160,915
2013	5,302	161,265
2014	5,206	160,137
2015	5,060	162,275
2016	4,876	168,784
2017	4,685	173,259
2018	4,502	178,772
2019	4,335	181,068
2020	4,188	181,015
2021	3,985	183,326
2022	3,319	186,625
2023	3,837	188,788

Maternal mortality chart: Brunei vs Sierra Leone

The maternal mortality rate, which is the probability of dying during childbirth or within 42 days of pregnancy termination, is 36 deaths per 100,000 live births in Brunei, compared to 354 deaths in Sierra Leone.

Table

Year	Maternal mortality per 100K births
	Brunei	Sierra Leone
1985	79	1,506
1986	78	1,530
1987	75	1,533
1988	73	1,549
1989	71	1,575
1990	68	1,572
1991	65	1,699
1992	62	1,681
1993	59	1,696
1994	58	1,755
1995	55	1,777
1996	54	1,726
1997	52	1,721
1998	51	1,753
1999	50	1,731
2000	48	1,603
2001	46	1,518
2002	46	1,492
2003	45	1,433
2004	44	1,366
2005	43	1,294
2006	42	1,168
2007	41	1,132
2008	40	1,093
2009	40	1,054
2010	40	1,018
2011	40	967
2012	40	915
2013	40	842
2014	40	821
2015	39	730
2016	39	633
2017	39	578
2018	39	491
2019	38	464
2020	39	422
2021	44	403
2022	88	370
2023	36	354

Under-five mortality rates

The chance that a newborn baby will die before reaching age five is 0.94% in Brunei and 9.43% in Sierra Leone. Below is the historical data on under-five mortality rates.

Table

Year	Mortality rate before reaching 5 years of age, per 1,000 live births
	Brunei	Sierra Leone
1960	8.9%	39.1%
1961	8.24%	38.5%
1962	7.66%	38%
1963	7.15%	37.4%
1964	6.7%	36.8%
1965	6.32%	36.2%
1966	5.98%	35.6%
1967	5.69%	35%
1968	5.42%	34.5%
1969	5.16%	33.9%
1970	4.91%	33.4%
1971	4.64%	32.9%
1972	4.35%	32.3%
1973	4.06%	31.9%
1974	3.77%	31.4%
1975	3.49%	30.9%
1976	3.21%	30.5%
1977	2.95%	30%
1978	2.71%	29.6%
1979	2.48%	29.2%
1980	2.28%	28.9%
1981	2.09%	28.5%
1982	1.93%	28.1%
1983	1.79%	27.8%
1984	1.67%	27.5%
1985	1.57%	27.2%
1986	1.48%	26.9%
1987	1.42%	26.6%
1988	1.38%	26.4%
1989	1.35%	26.2%
1990	1.33%	25.9%
1991	1.32%	25.7%
1992	1.31%	25.5%
1993	1.3%	25.3%
1994	1.27%	25%
1995	1.23%	24.7%
1996	1.19%	24.3%
1997	1.15%	23.9%
1998	1.1%	23.4%
1999	1.07%	22.9%
2000	1.03%	22.4%
2001	1%	21.8%
2002	0.98%	21.3%
2003	0.96%	20.7%
2004	0.95%	20.1%
2005	0.95%	19.4%
2006	0.95%	18.8%
2007	0.95%	18.1%
2008	0.96%	17.3%
2009	0.96%	16.6%
2010	0.97%	15.9%
2011	0.98%	15.2%
2012	0.99%	14.5%
2013	0.99%	13.9%
2014	1%	13.7%
2015	1%	13.8%
2016	1%	12.3%
2017	1%	11.8%
2018	0.99%	11.3%
2019	0.98%	10.9%
2020	0.97%	10.5%
2021	0.96%	10.1%
2022	0.95%	9.77%
2023	0.94%	9.43%