| 年份 | 单位：% |
| 含“(E)”其对应值为系统预测，仅供参考。 | |
| 2024（E） | 购买后可见 » |
| 2023（E） | 购买后可见 » |
| 2022（E） | 购买后可见 » |
| 2021 | 购买后可见 » |
| 2020 | 购买后可见 » |
| 2019 | 购买后可见 » |
| 2018 | 购买后可见 » |
| 2017 | 购买后可见 » |
| 2016 | 购买后可见 » |
| 2015 | 购买后可见 » |
| 2013 | 购买后可见 » |
| 2012 | 购买后可见 » |
| 2011 | 购买后可见 » |
| 2010 | 72.86 |
| 2009 | 72.01 |
| 2008 | 71.55 |
| 2007 | 70.77 |
| 2006 | 71.24 |
| 2005 | 71.16 |
| 2004 | 70.71 |
| 2003 | 69.40 |
| 2002 | 69.04 |
| 2001 | 69.03 |
| 2000 | 69.04 |
| 1999 | 69.19 |
| 1998 | 69.44 |
| 1997 | 69.23 |
| 1996 | 71.50 |
| 1995 | 71.05 |
| 1994 | 65.20 |
| 1993 | 67.32 |
| 1992 | 66.00 |
| 1991 | 65.90 |
| 1990 | 67.20 |
| 1989 | 66.51 |
| 1988 | 66.54 |
| 1987 | 67.48 |
| 1986 | 68.32 |
| 1985 | 68.29 |
| 1984 | 69.16 |
| 1983 | 69.93 |
| 1982 | 69.20 |
| 1981 | 69.28 |
| 1980 | 69.54 |
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