|
| 儿童和青少年(%) | 青年和中年(%) | 老年(%) |
| 1860 | 51.2 | 46.1 | 2.7 |
| 1870 | 49.7 | 47.3 | 3 |
| 1880 | 48.1 | 48.5 | 3.4 |
| 1890 | 46.1 | 50 | 3.9 |
| 1900 | 44.4 | 51.4 | 4.1 |
| 1910 | 42 | 53.6 | 4.3 |
| 1920 | 40.7 | 54.5 | 4.7 |
| 1930 | 38.8 | 55.7 | 5.4 |
| 1940 | 34.4 | 58.7 | 6.8 |
| 1950 | 33.9 | 57.9 | 8.1 |
| 1960 | 38.4 | 52.3 | 9.2 |
| 1970 | 37.9 | 52.3 | 9.8 |
| 1980 | 32 | 56.7 | 11.3 |
| 1990 | 28.9 | 58.7 | 12.5 |
| 2000 | 28.6 | 59 | 12.4 |
| 2005 | 27.5 | 60 | 12.4 |
| 2010 | 24 | 53 | 13 |