| 年份 | 单位：所 |
| 2011 | 4856.00 |
| 2010 | 5273.00 |
| 2009 | 5805.00 |
| 2008 | 6128.00 |
| 2007 | 6191.00 |
| 2006 | 6100.00 |
| 2005 | 6423.00 |
| 2004 | 6478.00 |
| 2003 | 6843.00 |
| 2002 | 7402.00 |
| 2001 | 7802.00 |
| 2000 | 8849.00 |
| 1999 | 9636.00 |
| 1998 | 10074.00 |
| 1997 | 10047.00 |
| 1996 | 10049.00 |
| 1995 | 10147.00 |
| 1994 | 10217.00 |
| 1993 | 9985.00 |
| 1992 | 9860.00 |
| 1991 | 9572.00 |
| 1990 | 9164.00 |
| 1989 | 9173.00 |
| 1988 | 8954.00 |
| 1987 | 8381.00 |
| 1986 | 8187.00 |
| 1985 | 8070.00 |
| 1984 | 7002.00 |
| 1983 | 5481.00 |
| 1982 | 3104.00 |
| 1981 | 2655.00 |
| 1980 | 3314.00 |
| 1965 | 61626.00 |
| 1964 | 15108.00 |
| 1963 | 4303.00 |
| 1962 | 3715.00 |
| 1961 | 7260.00 |
| 1960 | 22597.00 |
| 1959 | 22302.00 |
| 1958 | 20023.00 |
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