Duration in years of interval between births	Order of birth	Total
Total	All orders	342,433
Total	First	171,565
Total	Second	135,912
Total	Third	27,314
Total	Fourth	5,126
Total	Fifth	1,427
Total	Sixth	552
Total	Seventh	287
Total	Eighth	111
Total	Ninth	74
Total	Tenth and over	65
0 years	All orders	23,617
0 years	First	22,377
0 years	Second	1,013
0 years	Third	159
0 years	Fourth	47
0 years	Fifth	12
0 years	Sixth	4
0 years	Seventh	3
0 years	Eighth	1
0 years	Ninth	1
0 years	Tenth and over	..
1 year	All orders	60,787
1 year	First	39,199
1 year	Second	16,505
1 year	Third	3,691
1 year	Fourth	838
1 year	Fifth	267
1 year	Sixth	136
1 year	Seventh	68
1 year	Eighth	37
1 year	Ninth	20
1 year	Tenth and over	26
2 years	All orders	69,819
2 years	First	35,374
2 years	Second	28,299
2 years	Third	4,721
2 years	Fourth	955
2 years	Fifth	254
2 years	Sixth	100
2 years	Seventh	57
2 years	Eighth	23
2 years	Ninth	22
2 years	Tenth and over	14
3 years	All orders	56,749
3 years	First	25,365
3 years	Second	26,194
3 years	Third	4,084
3 years	Fourth	733
3 years	Fifth	215
3 years	Sixth	77
3 years	Seventh	41
3 years	Eighth	21
3 years	Ninth	8
3 years	Tenth and over	11
4 years	All orders	41,474
4 years	First	16,921
4 years	Second	20,312
4 years	Third	3,431
4 years	Fourth	551
4 years	Fifth	145
4 years	Sixth	59
4 years	Seventh	33
4 years	Eighth	6
4 years	Ninth	7
4 years	Tenth and over	9
5 years	All orders	28,835
5 years	First	10,972
5 years	Second	14,485
5 years	Third	2,712
5 years	Fourth	447
5 years	Fifth	143
5 years	Sixth	46
5 years	Seventh	16
5 years	Eighth	9
5 years	Ninth	3
5 years	Tenth and over	2
6 years	All orders	18,201
6 years	First	6,725
6 years	Second	8,976
6 years	Third	1,981
6 years	Fourth	366
6 years	Fifth	93
6 years	Sixth	35
6 years	Seventh	13
6 years	Eighth	6
6 years	Ninth	6
6 years	Tenth and over	..
7 years	All orders	12,246
7 years	First	4,395
7 years	Second	5,970
7 years	Third	1,500
7 years	Fourth	262
7 years	Fifth	70
7 years	Sixth	29
7 years	Seventh	15
7 years	Eighth	3
7 years	Ninth	..
7 years	Tenth and over	2
8 years	All orders	8,541
8 years	First	2,953
8 years	Second	4,138
8 years	Third	1,129
8 years	Fourth	238
8 years	Fifth	52
8 years	Sixth	14
8 years	Seventh	15
8 years	Eighth	..
8 years	Ninth	2
8 years	Tenth and over	..
9 years	All orders	5,918
9 years	First	2,052
9 years	Second	2,635
9 years	Third	968
9 years	Fourth	178
9 years	Fifth	59
9 years	Sixth	14
9 years	Seventh	8
9 years	Eighth	3
9 years	Ninth	1
9 years	Tenth and over	..
10 years	All orders	4,426
10 years	First	1,453
10 years	Second	2,084
10 years	Third	712
10 years	Fourth	127
10 years	Fifth	33
10 years	Sixth	10
10 years	Seventh	3
10 years	Eighth	1
10 years	Ninth	2
10 years	Tenth and over	1
11 years	All orders	3,230
11 years	First	1,034
11 years	Second	1,470
11 years	Third	577
11 years	Fourth	116
11 years	Fifth	17
11 years	Sixth	10
11 years	Seventh	6
11 years	Eighth	..
11 years	Ninth	..
11 years	Tenth and over	..
12 years and over	All orders	8,590
12 years and over	First	2,745
12 years and over	Second	3,831
12 years and over	Third	1,649
12 years and over	Fourth	268
12 years and over	Fifth	67
12 years and over	Sixth	18
12 years and over	Seventh	9
12 years and over	Eighth	1
12 years and over	Ninth	2
12 years and over	Tenth and over	..