| 年份 | 单位：千克 |
| 2012 | 购买后可见 » |
| 2011 | 购买后可见 » |
| 2010 | 购买后可见 » |
| 2009 | 购买后可见 » |
| 2008 | 购买后可见 » |
| 2007 | 购买后可见 » |
| 2006 | 购买后可见 » |
| 2005 | 购买后可见 » |
| 2004 | 购买后可见 » |
| 2003 | 购买后可见 » |
| 2002 | 10.56 |
| 2001 | 10.41 |
| 2000 | 11.21 |
| 1999 | 10.92 |
| 1998 | 10.76 |
| 1997 | 11.13 |
| 1996 | 9.64 |
| 1995 | 9.74 |
| 1994 | 9.68 |
| 1993 | 8.86 |
| 1992 | 9.45 |
| 1990 | 7.25 |
| 1985 | 6.84 |
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