| 年份 | 单位：万人 |
| 2011 | 31.70 |
| 2010 | 30.90 |
| 2009 | 32.60 |
| 2008 | 32.60 |
| 2007 | 31.70 |
| 2006 | 30.70 |
| 2005 | 30.27 |
| 2004 | 29.40 |
| 2003 | 28.90 |
| 2002 | 31.01 |
| 2001 | 30.59 |
| 2000 | 32.00 |
| 1999 | 33.60 |
| 1998 | 33.57 |
| 1997 | 32.20 |
| 1996 | 30.80 |
| 1995 | 29.20 |
| 1994 | 27.70 |
| 1993 | 26.20 |
| 1992 | 24.80 |
| 1991 | 23.50 |
| 1990 | 22.40 |
| 1989 | 21.40 |
| 1988 | 20.30 |
| 1987 | 18.50 |
| 1986 | 16.40 |
| 1985 | 14.10 |
| 1984 | 10.40 |
| 1983 | 7.30 |
| 1982 | 4.00 |
| 1981 | 2.90 |
| 1980 | 2.30 |
| 1965 | 19.70 |
| 1964 | 4.70 |
| 1963 | 1.60 |
| 1962 | 1.30 |
| 1961 | 2.70 |
| 1960 | 8.50 |
| 1959 | 6.50 |
| 1958 | 6.00 |
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