| 年份 | 單位：個 |
| 2011 | 59941.00 |
| 2010 | 59681.00 |
| 2009 | 59918.00 |
| 2008 | 59572.00 |
| 2007 | 60531.00 |
| 2006 | 60037.00 |
| 2005 | 60397.00 |
| 2004 | 60864.00 |
| 2003 | 62968.00 |
| 2002 | 63858.00 |
| 2001 | 64840.00 |
| 2000 | 66095.00 |
| 1999 | 66935.00 |
| 1998 | 66614.00 |
| 1997 | 67479.00 |
| 1996 | 67556.00 |
| 1995 | 67460.00 |
| 1994 | 67524.00 |
| 1993 | 60460.00 |
| 1992 | 61006.00 |
| 1991 | 62768.00 |
| 1990 | 62126.00 |
| 1989 | 61613.00 |
| 1988 | 61383.00 |
| 1987 | 60429.00 |
| 1986 | 59693.00 |
| 1985 | 59342.00 |
| 1984 | 67169.00 |
| 1983 | 66662.00 |
| 1982 | 66149.00 |
| 1981 | 65911.00 |
| 1980 | 65315.00 |
| 1979 | 65009.00 |
| 1978 | 64311.00 |
| 1977 | 63952.00 |
| 1976 | 63184.00 |
| 1975 | 62425.00 |
| 1974 | 65258.00 |
| 1973 | 64583.00 |
| 1972 | 63050.00 |
| 1971 | 62766.00 |
| 1970 | 64822.00 |
| 1969 | 57988.00 |
| 1968 | 57041.00 |
| 1967 | 52055.00 |
| 1966 | 42156.00 |
| 1965 | 42711.00 |
| 1964 | 36744.00 |
| 1963 | 32706.00 |
| 1962 | 34379.00 |
| 1961 | 38611.00 |
| 1960 | 32333.00 |
| 1959 | 35535.00 |
| 1958 | 48580.00 |
| 1957 | 4179.00 |
| 1956 | 3903.00 |
| 1955 | 3740.00 |
| 1954 | 3658.00 |
| 1953 | 3580.00 |
| 1952 | 3540.00 |
| 1951 | 3150.00 |
| 1950 | 2880.00 |
| 1949 | 2600.00 |
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