| 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 | 90.88 |
| 2004 | 93.38 |
| 2003 | 91.96 |
| 2002 | 91.50 |
| 2001 | 92.53 |
| 2000 | 92.48 |
| 1999 | 91.61 |
| 1998 | 90.13 |
| 1997 | 89.28 |
| 1996 | 89.47 |
| 1995 | 87.83 |
| 1994 | 86.73 |
| 1993 | 86.26 |
| 1992 | 84.29 |
| 1991 | 85.62 |
| 1990 | 84.62 |
| 1989 | 85.15 |
| 1988 | 83.91 |
| 1987 | 84.30 |
| 1986 | 85.46 |
| 1985 | 82.29 |
| 1984 | 85.05 |
| 1983 | 83.59 |
| 1982 | 84.41 |
| 1981 | 85.59 |
| 1980 | 85.14 |
| 1979 | 85.65 |
| 1978 | 82.88 |
| 1977 | 81.14 |
| 1976 | 80.90 |
| 1975 | 80.88 |
| 1974 | 82.30 |
| 1973 | 84.38 |
| 1972 | 80.26 |
| 1971 | 79.79 |
| 1970 | 77.86 |
| 1969 | 73.67 |
| 1968 | 70.95 |
| 1967 | 75.94 |
| 1966 | 76.29 |
| 1965 | 77.57 |
| 1964 | 72.29 |
| 1963 | 71.11 |
| 1962 | 70.09 |
| 1961 | 69.44 |
| 1960 | 67.24 |
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