| 序号 | 时间 (年) |
数据 (‰) |
|---|---|---|
| 1 | 2022 | |
| 2 | 2021 | |
| 3 | 2020 | |
| 4 | 2019 | |
| 5 | 2018 | |
| 6 | 2017 | |
| 7 | 2016 | |
| 8 | 2015 | |
| 9 | 2014 | |
| 10 | 2013 | |
| 11 | 2012 | 2.39 |
| 12 | 2011 | 2.26 |
| 13 | 2010 | 2.16 |
| 14 | 2009 | 2.05 |
| 15 | 2005 | 1.43 |
| 16 | 2000 | 0.65 |
| 17 | 1995 | 0.42 |
| 18 | 1990 | 0.19 |
