| 序号 | 时间 (年) |
数据 (%) |
|---|---|---|
| 1 | 2018 | |
| 2 | 2017 | |
| 3 | 2016 | |
| 4 | 2015 | |
| 5 | 2014 | |
| 6 | 2013 | |
| 7 | 2012 | |
| 8 | 2011 | |
| 9 | 2010 | |
| 10 | 2009 | |
| 11 | 2008 | 3.41 |
| 12 | 2007 | 3.38 |
| 13 | 2006 | 3.47 |
| 14 | 2005 | 3.30 |
| 15 | 2004 | 3.25 |
| 16 | 2003 | 2.81 |
| 17 | 2002 | 2.78 |
| 18 | 2001 | 2.87 |
| 19 | 2000 | 2.80 |
| 20 | 1999 | 2.89 |
| 21 | 1998 | 2.92 |
| 22 | 1997 | 3.43 |
| 23 | 1996 | 3.83 |
| 24 | 1995 | 4.18 |
| 25 | 1994 | 4.81 |
| 26 | 1993 | 4.27 |
| 27 | 1992 | 3.79 |
| 28 | 1991 | 4.02 |
| 29 | 1990 | 3.62 |
| 30 | 1989 | 4.07 |
| 31 | 1988 | 4.38 |
| 32 | 1987 | 4.45 |
| 33 | 1986 | 4.46 |
| 34 | 1985 | 4.08 |
| 35 | 1984 | 4.20 |
| 36 | 1983 | 4.72 |
| 37 | 1982 | 4.18 |
| 38 | 1981 | 4.31 |
| 39 | 1980 | 5.02 |
| 40 | 1979 | 5.18 |
| 41 | 1978 | 5.32 |
| 42 | 1977 | 5.00 |
| 43 | 1976 | 3.67 |
| 44 | 1975 | 3.24 |
| 45 | 1974 | 5.28 |
| 46 | 1973 | 7.06 |
| 47 | 1972 | 4.44 |
| 48 | 1971 | 3.64 |
