| 年份 | 单位：% |
| 含“(E)”其对应值为系统预测，仅供参考。 | |
| 2030（E） | 购买后可见 » |
| 2029（E） | 购买后可见 » |
| 2028（E） | 购买后可见 » |
| 2027 | 购买后可见 » |
| 2026 | 购买后可见 » |
| 2025 | 购买后可见 » |
| 2024 | 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 | 64.62 |
| 2016 | 68.95 |
| 2015 | 71.95 |
| 2014 | 75.28 |
| 2013 | 78.32 |
| 2012 | 80.75 |
| 2011 | 79.42 |
| 2010 | 82.00 |
| 2009 | 73.16 |
| 2008 | 65.68 |
| 2007 | 64.16 |
| 2006 | 66.89 |
| 2005 | 66.38 |
| 2004 | 64.68 |
| 2003 | 62.77 |
| 2002 | 59.61 |
| 2001 | 57.92 |
| 2000 | 58.74 |
| 1999 | 59.64 |
| 1998 | 59.32 |
| 1997 | 59.15 |
| 1996 | 57.95 |
| 1995 | 55.14 |
| 1994 | 47.65 |
| 1993 | 45.46 |
| 1992 | 41.69 |
| 1991 | 39.01 |
| 1990 | 42.25 |
| 1989 | 40.65 |
| 1988 | 42.03 |
| 1987 | 41.60 |
| 1986 | 40.54 |
| 1985 | 40.69 |
| 1984 | 40.09 |
| 1983 | 39.38 |
| 1982 | 37.79 |
| 1981 | 34.86 |
| 1980 | 31.25 |
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