| 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 | 83.47 |
| 2004 | 81.80 |
| 2003 | 80.79 |
| 2002 | 81.36 |
| 2001 | 79.84 |
| 2000 | 80.56 |
| 1999 | 80.97 |
| 1998 | 79.52 |
| 1997 | 80.07 |
| 1996 | 77.86 |
| 1995 | 79.61 |
| 1994 | 78.60 |
| 1993 | 77.70 |
| 1992 | 79.25 |
| 1991 | 77.96 |
| 1990 | 77.40 |
| 1989 | 77.61 |
| 1988 | 79.30 |
| 1987 | 81.85 |
| 1986 | 82.89 |
| 1985 | 85.41 |
| 1984 | 86.59 |
| 1983 | 92.00 |
| 1982 | 93.07 |
| 1981 | 93.35 |
| 1980 | 94.03 |
| 1979 | 91.40 |
| 1978 | 91.67 |
| 1977 | 91.59 |
| 1976 | 93.93 |
| 1975 | 92.73 |
| 1974 | 92.09 |
| 1973 | 92.19 |
| 1972 | 90.76 |
| 1971 | 92.51 |
| 1970 | 93.39 |
| 1969 | 92.46 |
| 1968 | 94.02 |
| 1967 | 93.65 |
| 1966 | 91.59 |
| 1965 | 92.83 |
| 1964 | 92.40 |
| 1963 | 91.05 |
| 1962 | 92.76 |
| 1961 | 92.11 |
| 1960 | 91.77 |
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