| 年份 | 单位：万人 |
| 2010 | 245.10 |
| 2009 | 257.60 |
| 2008 | 265.30 |
| 2007 | 273.80 |
| 2006 | 262.40 |
| 2005 | 258.70 |
| 2004 | 236.60 |
| 2003 | 236.50 |
| 2002 | 264.40 |
| 2001 | 270.00 |
| 2000 | 277.70 |
| 1999 | 305.70 |
| 1998 | 316.30 |
| 1997 | 433.80 |
| 1996 | 455.90 |
| 1995 | 453.90 |
| 1994 | 459.80 |
| 1993 | 460.40 |
| 1992 | 464.40 |
| 1991 | 458.60 |
| 1990 | 437.80 |
| 1985 | 373.60 |
| 1980 | 304.60 |
| 1978 | 253.60 |
| 1975 | 213.90 |
| 1970 | 163.70 |
| 1965 | 105.90 |
| 1962 | 101.20 |
| 1957 | 67.10 |
| 1952 | 44.80 |
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