| 年份 | 单位：张 |
| 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 | 23.20 |
| 2001 | 23.90 |
| 2000 | 23.80 |
| 1999 | 23.90 |
| 1998 | 24.00 |
| 1997 | 23.50 |
| 1996 | 23.40 |
| 1995 | 23.90 |
| 1994 | 23.60 |
| 1993 | 23.60 |
| 1992 | 23.40 |
| 1991 | 23.20 |
| 1990 | 23.20 |
| 1989 | 22.80 |
| 1988 | 22.50 |
| 1987 | 22.00 |
| 1986 | 21.40 |
| 1985 | 21.40 |
| 1984 | 20.80 |
| 1983 | 20.50 |
| 1982 | 20.20 |
| 1981 | 20.20 |
| 1980 | 20.20 |
| 1979 | 19.90 |
| 1978 | 19.30 |
| 1975 | 17.30 |
| 1970 | 13.30 |
| 1965 | 10.60 |
| 1962 | 10.30 |
| 1957 | 4.60 |
| 1952 | 2.80 |
| 1949 | 1.50 |
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