| 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 » |
| 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 | 购买后可见 » |
| 2012 | 23.60 |
| 2011 | 23.30 |
| 2010 | 23.00 |
| 2009 | 22.80 |
| 2008 | 22.40 |
| 2007 | 22.00 |
| 2006 | 21.60 |
| 2005 | 21.52 |
| 2004 | 21.50 |
| 2003 | 21.40 |
| 2002 | 20.80 |
| 2001 | 20.80 |
| 2000 | 23.50 |
| 1999 | 23.30 |
| 1998 | 22.80 |
| 1997 | 22.50 |
| 1996 | 23.00 |
| 1995 | 21.80 |
| 1994 | 21.50 |
| 1993 | 20.30 |
| 1992 | 18.70 |
| 1991 | 17.70 |
| 1990 | 17.50 |
| 1989 | 17.80 |
| 1988 | 18.40 |
| 1987 | 18.30 |
| 1986 | 17.60 |
| 1985 | 16.80 |
| 1984 | 15.50 |
| 1983 | 13.90 |
| 1982 | 13.80 |
| 1981 | 13.90 |
| 1980 | 14.10 |
| 1979 | 14.00 |
| 1978 | 13.40 |
| 1977 | 12.33 |
| 1976 | 12.20 |
| 1975 | 11.96 |
| 1974 | 11.15 |
| 1973 | 10.83 |
| 1972 | 11.05 |
| 1971 | 10.46 |
| 1970 | 9.55 |
| 1969 | 8.45 |
| 1968 | 8.15 |
| 1967 | 8.10 |
| 1966 | 8.07 |
| 1965 | 8.03 |
| 1964 | 7.74 |
| 1963 | 7.73 |
| 1962 | 7.00 |
| 1961 | 9.90 |
| 1960 | 13.20 |
| 1959 | 17.62 |
| 1958 | 17.19 |
| 1957 | 6.87 |
| 1956 | 7.96 |
| 1955 | 5.98 |
| 1954 | 7.30 |
| 1953 | 7.45 |
| 1952 | 6.45 |
| 1951 | 5.59 |
| 1950 | 4.95 |
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