| 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 | 20.28 |
| 2001 | 15.95 |
| 2000 | 16.73 |
| 1999 | 16.91 |
| 1998 | 15.88 |
| 1997 | 15.34 |
| 1996 | 17.07 |
| 1995 | 17.24 |
| 1994 | 17.12 |
| 1993 | 17.40 |
| 1992 | 17.70 |
| 1990 | 18.46 |
| 1985 | 16.68 |
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