May 5th is Children's day in Japan. Every year Ministry of Internal Affairs and Communications reports the number of children on May 4th. According to it, the number of children has been decreasing since 1982. The portion of children has been decreasing also since 1975.
Figure 1: The changes in the number of children (0-14 year-old) in Japan, 1950-2016
| Year | Total | Age 0-14 | Age 0-14 | Age 15-64 | Age 65- |
| Population | Population | % | % | % | |
| 1950 | 83,200,000 | 29,430,000 | 35.4 | 59.7 | 4.9 |
| 1955 | 89,280,000 | 29,800,000 | 33.4 | 61.3 | 5.3 |
| 1960 | 93,420,000 | 28,070,000 | 30.0 | 64.2 | 5.7 |
| 1965 | 98,270,000 | 25,170,000 | 25.6 | 68.1 | 6.3 |
| 1970 | 103,720,000 | 24,820,000 | 23.9 | 69.0 | 7.1 |
| 1975 | 111,940,000 | 27,230,000 | 24.3 | 67.7 | 7.9 |
| 1980 | 117,060,000 | 27,520,000 | 23.5 | 67.4 | 9.1 |
| 1985 | 121,050,000 | 26,040,000 | 21.5 | 68.2 | 10.3 |
| 1990 | 123,610,000 | 22,540,000 | 18.2 | 69.7 | 12.1 |
| 1995 | 125,570,000 | 20,030,000 | 16.0 | 69.5 | 14.6 |
| 2000 | 126,930,000 | 18,510,000 | 14.6 | 68.1 | 17.4 |
| 2005 | 127,770,000 | 17,590,000 | 13.8 | 66.1 | 20.2 |
| 2010 | 128,060,000 | 16,840,000 | 13.1 | 63.8 | 23.0 |
| 2015 | 127,130,000 | 16,200,000 | 12.7 | 60.9 | 26.4 |
| 2016 | 126,980,000 | 16,050,000 | 12.6 | 60.3 | 27.0 |
The data of 2015 and 2016 are provisional. They will be adjusted later.
Figure 2: The changes in the percentage of children (0-14 year-old) in Japan, 1950-2016
Source is Ministry of Internal Affairs and Communications.
www.stat.go.jp/data/jinsui/topics/topi940.htm
www.stat.go.jp/data/jinsui/topics/pdf/topics94.pdf
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