| 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 | 8.52 |
| 2001 | 8.08 |
| 2000 | 8.16 |
| 1999 | 7.78 |
| 1998 | 7.55 |
| 1997 | 7.20 |
| 1996 | 7.13 |
| 1995 | 7.11 |
| 1994 | 7.53 |
| 1993 | 7.14 |
| 1992 | 6.65 |
| 1990 | 6.40 |
| 1985 | 5.76 |
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