| 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 | 12.99 |
| 2004 | 14.90 |
| 2003 | 15.58 |
| 2002 | 14.93 |
| 2001 | 16.60 |
| 2000 | 15.75 |
| 1999 | 15.12 |
| 1998 | 16.64 |
| 1997 | 16.57 |
| 1996 | 18.29 |
| 1995 | 16.36 |
| 1994 | 17.52 |
| 1993 | 18.32 |
| 1992 | 17.00 |
| 1991 | 18.01 |
| 1990 | 18.13 |
| 1989 | 18.49 |
| 1988 | 20.21 |
| 1987 | 17.68 |
| 1986 | 16.63 |
| 1985 | 14.10 |
| 1984 | 12.55 |
| 1983 | 7.51 |
| 1982 | 6.80 |
| 1981 | 6.37 |
| 1980 | 5.75 |
| 1979 | 8.72 |
| 1978 | 8.42 |
| 1977 | 8.42 |
| 1976 | 6.11 |
| 1975 | 7.32 |
| 1974 | 8.07 |
| 1973 | 8.12 |
| 1972 | 9.56 |
| 1971 | 7.97 |
| 1970 | 6.92 |
| 1969 | 8.11 |
| 1968 | 6.44 |
| 1967 | 6.76 |
| 1966 | 9.19 |
| 1965 | 7.41 |
| 1964 | 8.22 |
| 1963 | 9.32 |
| 1962 | 7.36 |
| 1961 | 8.01 |
| 1960 | 8.31 |
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