| 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 | 35.10 |
| 2012 | 34.90 |
| 2011 | 34.80 |
| 2010 | 34.60 |
| 2009 | 34.20 |
| 2008 | 33.60 |
| 2007 | 33.10 |
| 2006 | 31.80 |
| 2005 | 29.90 |
| 2004 | 28.20 |
| 2003 | 25.50 |
| 2002 | 23.40 |
| 2001 | 21.60 |
| 2000 | 17.20 |
| 1999 | 20.40 |
| 1998 | 21.60 |
| 1997 | 21.40 |
| 1996 | 20.20 |
| 1995 | 18.40 |
| 1994 | 17.40 |
| 1993 | 15.70 |
| 1992 | 13.80 |
| 1991 | 13.40 |
| 1990 | 13.60 |
| 1989 | 14.10 |
| 1988 | 13.20 |
| 1987 | 12.40 |
| 1986 | 12.30 |
| 1985 | 11.80 |
| 1984 | 10.70 |
| 1983 | 10.30 |
| 1982 | 9.20 |
| 1981 | 9.10 |
| 1980 | 8.90 |
| 1979 | 8.80 |
| 1978 | 8.20 |
| 1977 | 7.57 |
| 1976 | 7.21 |
| 1975 | 7.08 |
| 1974 | 7.02 |
| 1973 | 6.91 |
| 1972 | 7.08 |
| 1971 | 7.34 |
| 1970 | 7.28 |
| 1969 | 7.35 |
| 1968 | 7.59 |
| 1967 | 7.67 |
| 1966 | 7.61 |
| 1965 | 7.83 |
| 1964 | 7.75 |
| 1963 | 7.54 |
| 1962 | 8.77 |
| 1961 | 9.22 |
| 1960 | 18.90 |
| 1959 | 23.62 |
| 1958 | 21.34 |
| 1957 | 9.34 |
| 1956 | 9.00 |
| 1955 | 9.16 |
| 1954 | 12.40 |
| 1953 | 8.97 |
| 1952 | 10.32 |
| 1951 | 7.12 |
| 1950 | 6.51 |
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