| 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 | 11.21 |
| 2004 | 11.14 |
| 2003 | 11.31 |
| 2002 | 10.99 |
| 2001 | 11.11 |
| 2000 | 11.23 |
| 1999 | 10.79 |
| 1998 | 11.12 |
| 1997 | 12.11 |
| 1996 | 12.29 |
| 1995 | 12.60 |
| 1994 | 13.51 |
| 1993 | 13.76 |
| 1992 | 13.51 |
| 1991 | 14.69 |
| 1990 | 14.79 |
| 1989 | 11.90 |
| 1988 | 8.20 |
| 1987 | 8.47 |
| 1986 | 8.39 |
| 1985 | 8.42 |
| 1984 | 7.35 |
| 1983 | 7.45 |
| 1982 | 7.05 |
| 1981 | 7.46 |
| 1980 | 7.19 |
| 1979 | 8.00 |
| 1978 | 8.35 |
| 1977 | 8.32 |
| 1976 | 7.76 |
| 1975 | 8.36 |
| 1974 | 8.72 |
| 1973 | 9.26 |
| 1972 | 10.05 |
| 1971 | 11.19 |
| 1970 | 12.95 |
| 1969 | 14.57 |
| 1968 | 16.55 |
| 1967 | 16.73 |
| 1966 | 18.28 |
| 1965 | 18.86 |
| 1964 | 18.69 |
| 1963 | 19.59 |
| 1962 | 21.53 |
| 1961 | 21.62 |
| 1960 | 23.66 |
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