| 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 | 2.45 |
| 2004 | 3.94 |
| 2003 | 5.94 |
| 2002 | 3.12 |
| 2001 | 5.40 |
| 2000 | 4.36 |
| 1999 | 2.96 |
| 1998 | 5.22 |
| 1997 | 5.64 |
| 1996 | 6.64 |
| 1995 | 3.82 |
| 1994 | 5.28 |
| 1993 | 4.24 |
| 1992 | 2.32 |
| 1991 | 4.69 |
| 1990 | 4.79 |
| 1989 | 3.24 |
| 1988 | 8.09 |
| 1987 | 6.33 |
| 1986 | 6.05 |
| 1985 | 8.42 |
| 1984 | 7.55 |
| 1983 | 6.20 |
| 1982 | 5.37 |
| 1981 | 4.35 |
| 1980 | 6.91 |
| 1979 | 10.00 |
| 1978 | 10.61 |
| 1977 | 10.72 |
| 1976 | 5.04 |
| 1975 | 7.17 |
| 1974 | 9.33 |
| 1973 | 9.13 |
| 1972 | 9.47 |
| 1971 | 8.46 |
| 1970 | 8.66 |
| 1969 | 10.69 |
| 1968 | 10.16 |
| 1967 | 10.92 |
| 1966 | 11.25 |
| 1965 | 8.62 |
| 1964 | 9.88 |
| 1963 | 9.71 |
| 1962 | 9.30 |
| 1961 | 9.06 |
| 1960 | 8.99 |
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