| 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 | 78.76 |
| 2004 | 76.57 |
| 2003 | 75.24 |
| 2002 | 75.33 |
| 2001 | 73.21 |
| 2000 | 74.03 |
| 1999 | 73.62 |
| 1998 | 70.83 |
| 1997 | 69.98 |
| 1996 | 67.08 |
| 1995 | 68.74 |
| 1994 | 66.53 |
| 1993 | 63.94 |
| 1992 | 64.57 |
| 1991 | 63.25 |
| 1990 | 61.61 |
| 1989 | 60.80 |
| 1988 | 62.21 |
| 1987 | 62.38 |
| 1986 | 60.88 |
| 1985 | 62.68 |
| 1984 | 63.94 |
| 1983 | 67.73 |
| 1982 | 70.62 |
| 1981 | 74.24 |
| 1980 | 76.70 |
| 1979 | 76.20 |
| 1978 | 77.56 |
| 1977 | 76.17 |
| 1976 | 79.56 |
| 1975 | 76.77 |
| 1974 | 76.49 |
| 1973 | 78.01 |
| 1972 | 74.17 |
| 1971 | 75.47 |
| 1970 | 74.50 |
| 1969 | 70.46 |
| 1968 | 69.44 |
| 1967 | 66.07 |
| 1966 | 58.88 |
| 1965 | 56.88 |
| 1964 | 56.24 |
| 1963 | 48.76 |
| 1962 | 50.42 |
| 1961 | 42.00 |
| 1960 | 39.12 |
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