| 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 | 86.35 |
| 2004 | 84.92 |
| 2003 | 82.74 |
| 2002 | 85.89 |
| 2001 | 83.49 |
| 2000 | 84.41 |
| 1999 | 86.25 |
| 1998 | 83.66 |
| 1997 | 82.25 |
| 1996 | 81.08 |
| 1995 | 83.58 |
| 1994 | 80.88 |
| 1993 | 81.55 |
| 1992 | 83.67 |
| 1991 | 79.97 |
| 1990 | 79.73 |
| 1989 | 84.19 |
| 1988 | 82.99 |
| 1987 | 84.34 |
| 1986 | 84.76 |
| 1985 | 82.28 |
| 1984 | 84.39 |
| 1983 | 85.67 |
| 1982 | 86.93 |
| 1981 | 87.42 |
| 1980 | 85.17 |
| 1979 | 81.24 |
| 1978 | 80.20 |
| 1977 | 79.50 |
| 1976 | 85.77 |
| 1975 | 82.74 |
| 1974 | 80.04 |
| 1973 | 79.68 |
| 1972 | 78.12 |
| 1971 | 77.94 |
| 1970 | 75.57 |
| 1969 | 69.79 |
| 1968 | 67.73 |
| 1967 | 66.02 |
| 1966 | 63.97 |
| 1965 | 65.54 |
| 1964 | 63.65 |
| 1963 | 62.91 |
| 1962 | 60.85 |
| 1961 | 59.74 |
| 1960 | 57.57 |
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