| 序号 | 时间 (年) |
数据 (‰) |
|---|---|---|
| 1 | 2024 | |
| 2 | 2023 | |
| 3 | 2022 | |
| 4 | 2021 | |
| 5 | 2020 | |
| 6 | 2019 | |
| 7 | 2018 | 1.88 |
| 8 | 2017 | 0.54 |
| 9 | 2016 | 3.31 |
| 10 | 2015 | 3.01 |
| 11 | 2014 | 3.17 |
| 12 | 2013 | 2.93 |
| 13 | 2012 | 0.50 |
| 14 | 2011 | 2.51 |
| 15 | 2010 | 2.66 |
| 16 | 2009 | 1.83 |
| 17 | 2008 | 3.07 |
| 18 | 2007 | 3.71 |
| 19 | 2006 | 2.01 |
| 20 | 2004 | 3.23 |
| 21 | 2003 | 0.39 |
| 22 | 2002 | 2.20 |
| 23 | 2001 | 2.96 |
| 24 | 2000 | 2.90 |
| 25 | 1999 | 5.58 |
| 26 | 1997 | 2.81 |
| 27 | 1995 | 6.28 |
| 28 | 1993 | 5.05 |
| 29 | 1992 | 5.30 |
| 30 | 1990 | 8.59 |
| 31 | 1980 | 10.43 |
| 32 | 1975 | 14.95 |
| 33 | 1970 | 33.94 |
| 34 | 1962 | 33.87 |
| 35 | 1952 | 22.99 |
