| 序号 | 时间 (年) |
数据 (%) |
|---|---|---|
| 1 | 2021 | |
| 2 | 2020 | |
| 3 | 2019 | |
| 4 | 2018 | |
| 5 | 2017 | |
| 6 | 2016 | |
| 7 | 2015 | |
| 8 | 2014 | |
| 9 | 2013 | |
| 10 | 2012 | |
| 11 | 2011 | 2.78 |
| 12 | 2010 | 3.06 |
| 13 | 2009 | 3.13 |
| 14 | 2008 | 3.17 |
| 15 | 2007 | 3.34 |
| 16 | 2006 | 3.65 |
| 17 | 2005 | 3.70 |
| 18 | 2004 | 3.31 |
| 19 | 2003 | 3.04 |
| 20 | 2002 | 2.94 |
| 21 | 2001 | 3.12 |
| 22 | 2000 | 3.28 |
| 23 | 1999 | 3.21 |
| 24 | 1998 | 3.49 |
| 25 | 1997 | 3.71 |
| 26 | 1996 | 3.78 |
| 27 | 1995 | 3.83 |
| 28 | 1994 | 3.99 |
| 29 | 1993 | 4.08 |
| 30 | 1992 | 3.91 |
| 31 | 1991 | 4.02 |
| 32 | 1990 | 4.73 |
| 33 | 1989 | 4.73 |
| 34 | 1988 | 4.83 |
| 35 | 1987 | 5.05 |
| 36 | 1986 | 4.83 |
| 37 | 1985 | 5.24 |
| 38 | 1984 | 4.96 |
| 39 | 1983 | 5.52 |
| 40 | 1982 | 4.97 |
| 41 | 1981 | 4.87 |
| 42 | 1980 | 4.91 |
| 43 | 1979 | 5.69 |
| 44 | 1978 | 5.38 |
| 45 | 1977 | 5.85 |
| 46 | 1976 | 5.60 |
| 47 | 1975 | 5.66 |
| 48 | 1974 | 6.68 |
| 49 | 1973 | 6.80 |
| 50 | 1972 | 6.94 |
| 51 | 1971 | 6.99 |
| 52 | 1970 | 7.22 |
| 53 | 1969 | 7.55 |
