| 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 | 88.68 |
| 2004 | 87.24 |
| 2003 | 87.21 |
| 2002 | 89.37 |
| 2001 | 87.73 |
| 2000 | 84.25 |
| 1999 | 81.50 |
| 1998 | 80.66 |
| 1997 | 76.10 |
| 1996 | 68.93 |
| 1995 | 61.44 |
| 1994 | 66.34 |
| 1993 | 65.76 |
| 1992 | 68.82 |
| 1991 | 67.18 |
| 1990 | 65.29 |
| 1989 | 59.66 |
| 1988 | 68.57 |
| 1987 | 67.41 |
| 1986 | 70.27 |
| 1985 | 67.02 |
| 1984 | 56.21 |
| 1983 | 60.89 |
| 1982 | 63.08 |
| 1981 | 69.89 |
| 1980 | 77.01 |
| 1979 | 82.85 |
| 1978 | 84.51 |
| 1977 | 81.59 |
| 1976 | 79.38 |
| 1975 | 75.03 |
| 1974 | 81.61 |
| 1973 | 83.78 |
| 1972 | 79.42 |
| 1971 | 78.81 |
| 1970 | 76.33 |
| 1969 | 71.96 |
| 1968 | 68.82 |
| 1967 | 73.48 |
| 1966 | 73.24 |
| 1965 | 74.35 |
| 1964 | 68.55 |
| 1963 | 67.56 |
| 1962 | 66.43 |
| 1961 | 65.72 |
| 1960 | 62.95 |
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