| 序号 | 时间 (年) |
数据 (%) |
|---|---|---|
| 1 | 2021 | |
| 2 | 2020 | |
| 3 | 2019 | |
| 4 | 2018 | |
| 5 | 2017 | |
| 6 | 2016 | |
| 7 | 2015 | 2.37 |
| 8 | 2014 | 2.35 |
| 9 | 2013 | 2.28 |
| 10 | 2012 | 2.31 |
| 11 | 2011 | 2.28 |
| 12 | 2010 | 2.38 |
| 13 | 2009 | 2.37 |
| 14 | 2008 | 2.31 |
| 15 | 2007 | 2.01 |
| 16 | 2006 | 2.50 |
| 17 | 2005 | 2.45 |
