| 年份 | 单位：% |
| 含“(E)”其对应值为系统预测，仅供参考。 | |
| 2026（E） | 购买后可见 » |
| 2025（E） | 购买后可见 » |
| 2024（E） | 购买后可见 » |
| 2023 | 购买后可见 » |
| 2022 | 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 | 98.10 |
| 2012 | 98.07 |
| 2011 | 97.63 |
| 2010 | 97.76 |
| 2009 | 97.43 |
| 2008 | 97.26 |
| 2007 | 97.45 |
| 2006 | 97.05 |
| 2005 | 96.70 |
| 2004 | 96.91 |
| 2003 | 96.56 |
| 2002 | 95.96 |
| 2001 | 95.05 |
| 2000 | 95.36 |
| 1999 | 94.74 |
| 1998 | 93.86 |
| 1997 | 93.99 |
| 1996 | 93.00 |
| 1995 | 92.83 |
| 1994 | 92.31 |
| 1993 | 91.51 |
| 1992 | 90.38 |
| 1991 | 89.53 |
| 1990 | 88.79 |
| 1989 | 86.82 |
| 1988 | 83.97 |
| 1987 | 81.33 |
| 1986 | 79.49 |
| 1985 | 77.84 |
| 1984 | 75.49 |
| 1983 | 73.68 |
| 1982 | 70.52 |
| 1981 | 68.88 |
| 1980 | 64.73 |
| 1979 | 60.14 |
| 1978 | 53.96 |
| 1977 | 47.21 |
| 1976 | 38.60 |
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