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Number of children distributed, by age and cohort, . Per cent¹²
Cohort of births	Number of children					Average number of children
Cohort of births	0	1	2	3	4 children or more	Average number of children
¹For the cohorts 1935 to 1950 - women residenting in Norway per 31.12. 1998. For the cohort 1955 - women residenting in Norway per 31.12. 2001. For the cohorts 1960 - women residenting in Norway per 31.12. 2005. For the cohorts 1965 - women residenting in Norway per 31.12. 2016. For the cohorts 1970 to 1996 - women residenting in Norway per 31.12.2016.
²For the cohorts 1940 to 1950 - men residenting in Norway per 31.12. 2004. For the cohort 1955 - men residenting in Norway per 31.12. 2005. For the cohort 1960 - men residenting in Norway per 31.12. 2010. For the cohorts 1965 to 1996 - men residenting in Norway per 31.12.2016.
Age of woman 20 years
1935	82.6	14.9	2.4	0.1	0.0	0.20
1940	79.6	16.9	3.2	0.3	0.0	0.24
1945	78.4	17.2	4.1	0.3	0.0	0.26
1950	76.7	19.0	4.0	0.3	0.0	0.28
1955	77.4	19.7	2.8	0.1	0.0	0.26
1960	84.2	14.2	1.6	0.1	0.0	0.18
1965	88.5	10.3	1.1	0.1	0.0	0.13
1970	89.7	9.3	0.9	0.1	0.0	0.11
1975	91.4	7.7	0.9	0.1	0.0	0.10
1980	92.2	7.0	0.8	0.1	0.0	0.09
1985	94.1	5.3	0.5	0.1	0.0	0.07
1990	94.2	5.3	0.5	0.0	0.0	0.06
1995	96.5	3.2	0.3	0.0	0.0	0.04
1996	96.9	2.9	0.2	0.0	0.0	0.03

Age of woman 25 years
1935	36.9	31.2	24.2	6.4	1.3	1.04
1940	34.8	28.5	26.4	8.1	2.2	1.14
1945	33.3	29.4	27.3	8.2	1.8	1.16
1950	34.4	32.0	27.4	5.4	0.7	1.06
1955	43.2	30.6	22.7	3.2	0.4	0.87
1960	52.6	27.5	17.1	2.5	0.3	0.71
1965	56.8	26.6	13.9	2.3	0.3	0.63
1970	61.9	24.1	11.8	1.9	0.3	0.55
1975	67.8	20.8	9.4	1.7	0.3	0.46
1980	71.6	18.8	8.0	1.4	0.3	0.40
1985	72.5	18.5	7.6	1.1	0.3	0.38
1990	76.0	16.1	6.9	0.9	0.1	0.33
1991	77.8	15.0	6.2	0.9	0.1	0.31

Age of woman 30 years
1935	16.9	18.5	35.5	20.2	8.9	1.86
1940	15.8	16.8	36.0	22.0	9.3	1.92
1945	15.2	18.4	41.3	19.1	5.9	1.82
1950	16.9	21.1	44.8	14.3	2.9	1.65
1955	22.4	23.9	39.4	12.1	2.3	1.48
1960	26.2	25.1	34.8	11.7	2.3	1.39
1965	29.4	25.7	32.1	10.6	2.1	1.31
1970	33.8	26.2	29.1	9.0	1.9	1.19
1975	39.0	26.3	25.8	7.2	1.7	1.07
1980	41.0	26.8	24.0	6.6	1.5	1.01
1985	43.3	25.9	23.4	6.0	1.4	0.97
1986	43.6	25.4	23.6	6.0	1.3	0.96

Age of woman 35 years
1935	11.2	11.9	32.0	26.8	18.1	2.29
1940	11.0	11.3	34.2	28.0	15.4	2.26
1945	10.6	12.8	42.2	25.2	9.1	2.09
1950	11.6	15.0	45.8	21.5	6.0	1.95
1955	14.5	16.6	42.6	21.0	5.4	1.86
1960	15.9	16.7	39.3	22.0	6.1	1.87
1965	17.3	17.5	39.0	20.5	5.6	1.82
1970	19.6	18.8	38.7	18.3	4.8	1.72
1975	21.2	19.4	38.2	16.7	4.5	1.65
1980	22.3	20.3	38.2	15.3	3.9	1.60
1981	22.7	20.0	38.3	15.4	3.7	1.58

Age of woman 40 years
1935	9.8	10.5	30.4	27.4	21.8	2.41
1940	9.7	10.1	33.9	29.0	17.3	2.34
1945	9.2	11.9	41.6	26.3	11.0	2.18
1950	9.7	13.5	45.4	23.3	8.0	2.06
1955	11.7	14.6	42.1	23.9	7.7	2.01
1960	12.6	14.2	39.2	25.3	8.8	2.07
1965	13.3	14.4	40.0	24.3	7.9	2.02
1970	14.3	15.2	40.9	22.6	7.2	1.96
1975	15.0	15.6	41.4	21.5	6.5	1.92
1976	15.2	15.7	41.6	20.9	6.7	1.91

Age of woman 45 years
1935	9.6	10.4	30.4	27.4	22.2	2.42
1940	9.5	10.1	33.7	29.1	17.6	2.35
1945	9.0	11.8	41.5	26.4	11.3	2.19
1950	9.4	13.3	45.4	23.5	8.4	2.08
1955	11.2	14.3	42.1	24.2	8.1	2.04
1960	11.9	13.8	39.4	25.6	9.2	2.10
1965	12.5	14.2	40.2	24.7	8.4	2.06
1970	13.4	14.7	41.2	23.1	7.6	2.00
1971	13.3	14.9	41.8	22.7	7.3	1.99

Age of man 20 years
1940	95.3	4.3	0.4	0.0	0.0	0.05
1945	94.1	5.3	0.6	0.0	0.0	0.07
1950	93.5	5.8	0.6	0.0	0.0	0.07
1955	94.0	5.8	0.3	0.0	0.0	0.06
1960	96.9	3.0	0.1	0.0	0.0	0.03
1965	97.6	2.4	0.1	0.0	0.0	0.03
1970	97.6	2.3	0.1	0.0	0.0	0.03
1975	98.2	1.7	0.1	0.0	0.0	0.02
1980	98.2	1.7	0.1	0.0	0.0	0.02
1985	98.7	1.3	0.1	0.0	0.0	0.01
1990	98.5	1.5	0.1	0.0	0.0	0.02
1995	99.0	1.0	0.0	0.0	0.0	0.01
1996	99.1	0.8	0.0	0.0	0.0	0.01

Age of man 25 years
1940	60.2	23.8	12.7	2.9	0.4	0.60
1945	55.5	26.3	14.7	3.1	0.4	0.67
1950	57.7	27.2	13.2	1.7	0.2	0.59
1955	66.7	23.1	9.4	0.7	0.1	0.44
1960	75.9	17.6	6.0	0.5	0.1	0.31
1965	78.4	16.2	4.8	0.6	0.1	0.28
1970	81.2	14.1	4.1	0.5	0.1	0.24
1975	85.3	11.1	3.1	0.4	0.1	0.19
1980	87.3	9.9	2.5	0.3	0.1	0.16
1985	86.8	10.1	2.7	0.3	0.1	0.17
1990	88.7	8.7	2.3	0.2	0.0	0.14
1991	89.5	8.2	2.1	0.2	0.0	0.13

Age of man 30 years
1940	28.5	21.1	32.3	13.8	4.3	1.45
1945	27.0	22.9	35.5	11.9	2.7	1.41
1950	31.2	24.9	34.6	8.1	1.2	1.23
1955	39.0	25.6	28.3	6.1	1.0	1.05
1960	46.2	24.8	22.4	5.6	1.0	0.91
1965	51.0	23.5	20.0	4.7	0.8	0.81
1970	55.3	22.9	17.0	4.0	0.8	0.72
1975	60.4	22.0	14.3	2.9	0.5	0.61
1980	61.5	21.6	13.7	2.8	0.5	0.59
1985	63.0	20.7	13.2	2.5	0.5	0.57
1986	63.8	20.2	13.1	2.5	0.4	0.56

Age of man 35 years
1940	18.2	12.8	36.7	22.8	9.6	1.96
1945	18.0	14.9	41.8	19.8	5.5	1.81
1950	20.5	17.0	41.7	16.5	4.3	1.68
1955	24.7	18.4	37.2	15.9	3.8	1.57
1960	29.9	18.6	32.3	15.3	3.9	1.46
1965	33.2	19.4	30.8	13.4	3.2	1.35
1970	35.8	20.4	29.9	11.1	2.8	1.26
1975	38.4	20.6	28.8	10.1	2.2	1.18
1980	40.1	20.5	28.0	9.3	2.1	1.13
1981	40.4	20.6	28.0	9.2	1.8	1.12

Age of man 40 years
1940	14.9	10.4	36.2	26.0	12.4	2.15
1945	14.9	12.4	41.1	23.3	8.3	2.01
1950	16.3	13.9	41.4	21.1	7.4	1.92
1955	19.2	14.7	37.4	21.4	7.4	1.86
1960	23.3	14.7	33.5	21.2	7.3	1.77
1965	25.7	15.5	33.7	19.1	6.0	1.66
1970	26.7	16.2	34.5	17.2	5.4	1.60
1975	28.7	16.4	34.3	16.3	4.3	1.53
1976	29.5	16.2	34.0	15.8	4.4	1.51

Age of man 45 years
1940	13.9	10.0	35.8	26.4	13.9	2.22
1945	13.3	11.5	40.4	24.3	10.5	2.09
1950	14.8	12.6	41.0	22.3	9.3	2.02
1955	17.2	13.5	37.1	23.1	9.2	1.98
1960	20.7	13.4	34.1	22.7	9.1	1.90
1965	22.9	14.3	34.1	20.8	7.9	1.80
1970	23.6	14.8	35.4	19.3	6.9	1.74
1971	23.7	15.1	35.5	19.2	6.5	1.72

Age of man 50 years
1940	13.6	9.8	35.7	26.5	14.4	2.25
1945	13.3	11.5	40.4	24.3	10.5	2.12
1950	14.4	12.3	40.7	22.6	10.0	2.06
1955	16.6	13.2	37.1	23.3	9.9	2.01
1960	19.9	13.0	34.2	23.0	9.9	1.95
1965	22.0	13.9	34.2	21.2	8.7	1.84
1966	21.5	14.7	35.1	20.8	8.0	1.83