| 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 | 3.35 |
| 2004 | 3.32 |
| 2003 | 3.34 |
| 2002 | 3.65 |
| 2001 | 3.60 |
| 2000 | 3.73 |
| 1999 | 3.79 |
| 1998 | 3.73 |
| 1997 | 3.92 |
| 1996 | 4.05 |
| 1995 | 4.12 |
| 1994 | 4.21 |
| 1993 | 4.25 |
| 1992 | 4.26 |
| 1991 | 4.15 |
| 1990 | 4.17 |
| 1989 | 2.19 |
| 1988 | 2.62 |
| 1987 | 2.79 |
| 1986 | 2.70 |
| 1985 | 2.56 |
| 1984 | 2.75 |
| 1983 | 2.86 |
| 1982 | 2.99 |
| 1981 | 3.07 |
| 1980 | 3.00 |
| 1979 | 2.95 |
| 1978 | 3.13 |
| 1977 | 3.29 |
| 1976 | 3.53 |
| 1975 | 3.83 |
| 1974 | 4.00 |
| 1973 | 3.81 |
| 1972 | 4.46 |
| 1971 | 5.18 |
| 1970 | 5.86 |
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