| 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 | 84.13 |
| 2004 | 82.76 |
| 2003 | 81.79 |
| 2002 | 85.26 |
| 2001 | 83.41 |
| 2000 | 84.09 |
| 1999 | 86.56 |
| 1998 | 83.56 |
| 1997 | 81.07 |
| 1996 | 80.60 |
| 1995 | 83.19 |
| 1994 | 80.79 |
| 1993 | 81.92 |
| 1992 | 83.54 |
| 1991 | 80.57 |
| 1990 | 80.40 |
| 1989 | 84.23 |
| 1988 | 82.13 |
| 1987 | 83.11 |
| 1986 | 84.22 |
| 1985 | 81.40 |
| 1984 | 84.55 |
| 1983 | 85.33 |
| 1982 | 85.29 |
| 1981 | 85.40 |
| 1980 | 84.32 |
| 1979 | 82.18 |
| 1978 | 81.26 |
| 1977 | 81.55 |
| 1976 | 85.37 |
| 1975 | 84.25 |
| 1974 | 81.90 |
| 1973 | 81.62 |
| 1972 | 80.42 |
| 1971 | 80.11 |
| 1970 | 78.37 |
| 1969 | 74.70 |
| 1968 | 73.17 |
| 1967 | 72.47 |
| 1966 | 70.49 |
| 1965 | 71.59 |
| 1964 | 71.45 |
| 1963 | 70.84 |
| 1962 | 68.98 |
| 1961 | 69.30 |
| 1960 | 67.36 |
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