| 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 » |
| 2014 | 购买后可见 » |
| 2013 | 购买后可见 » |
| 2012 | 购买后可见 » |
| 2011 | 73.99 |
| 2010 | 74.40 |
| 2009 | 73.78 |
| 2008 | 72.40 |
| 2007 | 69.30 |
| 2006 | 68.90 |
| 2005 | 66.60 |
| 2004 | 65.50 |
| 2003 | 59.00 |
| 2002 | 55.40 |
| 2001 | 54.40 |
| 2000 | 54.60 |
| 1999 | 53.00 |
| 1998 | 52.20 |
| 1997 | 50.00 |
| 1996 | 49.60 |
| 1995 | 48.70 |
| 1994 | 48.00 |
| 1993 | 45.10 |
| 1992 | 43.60 |
| 1991 | 41.60 |
| 1990 | 40.60 |
| 1989 | 39.80 |
| 1988 | 39.10 |
| 1987 | 38.60 |
| 1986 | 37.30 |
| 1985 | 36.30 |
| 1984 | 35.40 |
| 1983 | 35.30 |
| 1982 | 35.80 |
| 1981 | 34.00 |
| 1980 | 32.80 |
| 1979 | 32.70 |
| 1978 | 31.60 |
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