| 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 | 12.15 |
| 12 | 2010 | 11.08 |
| 13 | 2009 | 10.53 |
| 14 | 2008 | 10.16 |
| 15 | 2007 | 9.77 |
| 16 | 2006 | 9.66 |
| 17 | 2005 | 9.29 |
| 18 | 2004 | 13.97 |
| 19 | 2003 | 11.66 |
| 20 | 2002 | 11.90 |
| 21 | 2001 | 11.20 |
| 22 | 2000 | 9.82 |
| 23 | 1999 | 10.83 |
| 24 | 1998 | 9.56 |
| 25 | 1997 | 8.64 |
| 26 | 1996 | 7.95 |
| 27 | 1995 | 7.54 |
| 28 | 1994 | 6.93 |
| 29 | 1993 | 6.40 |
| 30 | 1992 | 5.90 |
| 31 | 1991 | 5.83 |
| 32 | 1990 | 5.94 |
| 33 | 1985 | 5.38 |
| 34 | 1980 | 4.62 |
| 35 | 1978 | 3.88 |
| 36 | 1975 | 2.94 |
| 37 | 1970 | 2.80 |
| 38 | 1965 | 4.20 |
| 39 | 1962 | 5.78 |
