| 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 | 2.41 |
| 12 | 2010 | 2.45 |
| 13 | 2009 | 2.47 |
| 14 | 2008 | 2.51 |
| 15 | 2007 | 2.55 |
| 16 | 2006 | 2.60 |
| 17 | 2005 | 2.64 |
| 18 | 2004 | 2.57 |
| 19 | 2003 | 2.50 |
| 20 | 2002 | 2.46 |
| 21 | 2001 | 2.42 |
| 22 | 2000 | 2.38 |
| 23 | 1999 | 2.30 |
| 24 | 1998 | 2.21 |
| 25 | 1997 | 2.17 |
| 26 | 1996 | 2.12 |
| 27 | 1995 | 2.08 |
| 28 | 1994 | 2.17 |
| 29 | 1993 | 2.29 |
| 30 | 1992 | 2.38 |
| 31 | 1991 | 2.43 |
| 32 | 1988 | 1.32 |
| 33 | 1983 | 0.65 |
