| 年份 | 单位：万人 |
| 2011 | 219.00 |
| 2010 | 232.00 |
| 2009 | 232.10 |
| 2008 | 216.70 |
| 2007 | 197.70 |
| 2006 | 179.50 |
| 2005 | 170.00 |
| 2004 | 142.50 |
| 2003 | 135.50 |
| 2002 | 145.43 |
| 2001 | 166.50 |
| 2000 | 176.28 |
| 1999 | 167.83 |
| 1998 | 162.77 |
| 1997 | 150.10 |
| 1996 | 139.60 |
| 1995 | 124.00 |
| 1994 | 107.60 |
| 1993 | 102.50 |
| 1992 | 96.70 |
| 1991 | 94.50 |
| 1990 | 89.30 |
| 1989 | 86.30 |
| 1988 | 81.00 |
| 1987 | 75.00 |
| 1986 | 57.90 |
| 1985 | 41.30 |
| 1984 | 27.80 |
| 1983 | 21.60 |
| 1982 | 13.10 |
| 1981 | 9.40 |
| 1980 | 7.90 |
| 1965 | 13.60 |
| 1964 | 4.94 |
| 1963 | 2.42 |
| 1962 | 4.50 |
| 1961 | 16.12 |
| 1960 | 14.89 |
| 1959 | 2.07 |
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