| 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 | 49.90 |
| 2012 | 50.00 |
| 2011 | 50.40 |
| 2010 | 43.60 |
| 2009 | 38.50 |
| 2008 | 47.60 |
| 2007 | 43.50 |
| 2006 | 43.90 |
| 2005 | 40.10 |
| 2004 | 39.30 |
| 2003 | 37.20 |
| 2002 | 46.80 |
| 2001 | 41.30 |
| 2000 | 56.50 |
| 1999 | 56.20 |
| 1998 | 54.40 |
| 1997 | 57.10 |
| 1996 | 57.60 |
| 1995 | 49.20 |
| 1994 | 49.00 |
| 1993 | 58.60 |
| 1992 | 57.20 |
| 1991 | 34.70 |
| 1990 | 36.50 |
| 1989 | 51.10 |
| 1988 | 54.80 |
| 1987 | 60.00 |
| 1986 | 69.90 |
| 1985 | 56.40 |
| 1984 | 58.50 |
| 1983 | 19.10 |
| 1982 | 10.00 |
| 1981 | -82.60 |
| 1980 | 42.10 |
| 1979 | 37.80 |
| 1978 | 56.40 |
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