| 年份 | 单位：% |
| 含“(E)”其对应值为系统预测，仅供参考。 | |
| 2025（E） | 购买后可见 » |
| 2024（E） | 购买后可见 » |
| 2023（E） | 购买后可见 » |
| 2022 | 购买后可见 » |
| 2021 | 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 | 39.40 |
| 2010 | 41.40 |
| 2009 | 43.00 |
| 2008 | 44.50 |
| 2007 | 44.30 |
| 2006 | 47.30 |
| 2005 | 49.50 |
| 2004 | 51.20 |
| 2003 | 54.10 |
| 2002 | 56.40 |
| 2001 | 59.60 |
| 2000 | 55.80 |
| 1999 | 54.50 |
| 1998 | 55.70 |
| 1997 | 56.00 |
| 1996 | 56.80 |
| 1995 | 56.10 |
| 1994 | 56.30 |
| 1993 | 56.30 |
| 1992 | 60.40 |
| 1991 | 60.10 |
| 1990 | 60.00 |
| 1989 | 60.00 |
| 1988 | 58.60 |
| 1987 | 58.80 |
| 1986 | 58.80 |
| 1985 | 61.40 |
| 1984 | 65.10 |
| 1983 | 66.20 |
| 1982 | 66.50 |
| 1980 | 68.70 |
| 1978 | 71.30 |
| 1975 | 77.40 |
| 1970 | 82.00 |
| 1965 | 84.50 |
| 1957 | 75.50 |
| 1952 | 87.10 |
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