| 年份 | 单位：% |
| 含“(E)”其对应值为系统预测，仅供参考。 | |
| 2018（E） | 购买后可见 » |
| 2017（E） | 购买后可见 » |
| 2016（E） | 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 | 购买后可见 » |
| 2010 | 购买后可见 » |
| 2009 | 购买后可见 » |
| 2008 | 购买后可见 » |
| 2007 | 购买后可见 » |
| 2006 | 购买后可见 » |
| 2005 | 93.42 |
| 2004 | 93.79 |
| 2003 | 93.99 |
| 2002 | 94.07 |
| 2001 | 94.39 |
| 2000 | 94.59 |
| 1999 | 94.18 |
| 1998 | 94.09 |
| 1997 | 93.51 |
| 1996 | 93.46 |
| 1995 | 93.85 |
| 1994 | 94.27 |
| 1993 | 94.16 |
| 1992 | 94.32 |
| 1991 | 94.06 |
| 1990 | 94.56 |
| 1989 | 96.63 |
| 1988 | 96.18 |
| 1987 | 95.58 |
| 1986 | 94.97 |
| 1985 | 95.70 |
| 1984 | 94.40 |
| 1983 | 94.84 |
| 1982 | 94.56 |
| 1981 | 94.75 |
| 1980 | 94.69 |
| 1979 | 94.94 |
| 1978 | 95.01 |
| 1977 | 95.48 |
| 1976 | 95.21 |
| 1975 | 94.69 |
| 1974 | 94.18 |
| 1973 | 94.54 |
| 1972 | 93.26 |
| 1971 | 92.20 |
| 1970 | 91.16 |
| 1969 | 97.29 |
| 1968 | 97.91 |
| 1967 | 97.11 |
| 1966 | 96.83 |
| 1965 | 98.27 |
| 1964 | 98.19 |
| 1963 | 97.68 |
| 1962 | 98.13 |
| 1961 | 98.20 |
| 1960 | 98.31 |
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