| 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 | 45.40 |
| 2016 | 49.31 |
| 2015 | 52.17 |
| 2014 | 54.87 |
| 2013 | 58.42 |
| 2012 | 59.37 |
| 2011 | 60.07 |
| 2010 | 61.95 |
| 2009 | 60.03 |
| 2008 | 53.15 |
| 2007 | 53.41 |
| 2006 | 56.24 |
| 2005 | 61.76 |
| 2004 | 60.00 |
| 2003 | 57.73 |
| 2002 | 54.30 |
| 2001 | 52.11 |
| 2000 | 51.51 |
| 1999 | 53.46 |
| 1998 | 51.82 |
| 1997 | 51.67 |
| 1996 | 50.30 |
| 1995 | 47.43 |
| 1994 | 39.45 |
| 1993 | 37.11 |
| 1992 | 33.40 |
| 1991 | 20.07 |
| 1990 | 20.70 |
| 1989 | 20.16 |
| 1988 | 21.23 |
| 1987 | 19.63 |
| 1986 | 18.84 |
| 1985 | 18.77 |
| 1984 | 18.79 |
| 1983 | 17.19 |
| 1982 | 15.88 |
| 1981 | 12.58 |
| 1980 | 9.12 |
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