| 序号 | 时间 (年) |
数据 (‰) |
|---|---|---|
| 1 | 2018 | |
| 2 | 2017 | |
| 3 | 2016 | |
| 4 | 2015 | |
| 5 | 2014 | |
| 6 | 2013 | |
| 7 | 2012 | 3.61 |
| 8 | 2011 | 4.66 |
| 9 | 2009 | 2.69 |
| 10 | 2008 | 2.62 |
| 11 | 2007 | 3.13 |
| 12 | 2006 | 4.77 |
| 13 | 2005 | 3.19 |
| 14 | 2004 | 3.12 |
| 15 | 2003 | 2.93 |
| 16 | 2002 | 2.67 |
| 17 | 2001 | 2.29 |
