| 年份 | 单位：千克 |
| 2011 | 473.08 |
| 2010 | 512.04 |
| 2009 | 0.53 |
| 2008 | 0.58 |
| 2007 | 0.57 |
| 2006 | 0.56 |
| 2005 | 0.54 |
| 2004 | 0.52 |
| 2003 | 0.49 |
| 2002 | 0.46 |
| 2001 | 0.44 |
| 2000 | 0.42 |
| 1999 | 0.39 |
| 1998 | 0.36 |
| 1997 | 0.31 |
| 1996 | 0.30 |
| 1995 | 0.29 |
| 1994 | 0.26 |
| 1993 | 0.25 |
| 1992 | 0.25 |
| 1991 | 0.24 |
| 1990 | 0.23 |
| 1989 | 0.22 |
| 1988 | 0.20 |
| 1987 | 0.15 |
| 1986 | 0.14 |
| 1985 | 0.14 |
| 1984 | 0.14 |
| 1983 | 0.13 |
| 1982 | 0.13 |
| 1981 | 0.12 |
| 1980 | 0.12 |
| 1979 | 0.12 |
| 1978 | 0.14 |
| 1977 | 0.13 |
| 1976 | 0.12 |
| 1975 | 0.09 |
| 1974 | 0.07 |
| 1973 | 0.08 |
| 1972 | 0.08 |
| 1971 | 0.07 |
| 1970 | 0.06 |
| 1969 | 0.06 |
| 1968 | 0.05 |
| 1967 | 0.05 |
| 1966 | 0.04 |
| 1965 | 0.06 |
| 1964 | 0.05 |
| 1963 | 0.04 |
| 1962 | 0.04 |
| 1961 | 0.03 |
| 1960 | 0.03 |
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