| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 7.5 | 8.6 | 6.19 |
| 2024 | 10.14 | 14.59 | 6.31 |
| 2023 | 6.91 | 12.14 | 4.01 |
| 2022 | 3.57 | 4.99 | 1.98 |
| 2021 | 14.72 | 40.41 | 1.99 |
| 2020 | 45.52 | 100.72 | 16.92 |
| 2019 | 20.97 | 31.38 | 12.59 |
| 2018 | 26.94 | 38.39 | 9.62 |
| 2017 | 42.03 | 73.32 | 21.09 |
| 2016 | 32.72 | 39.28 | 25.76 |
| 2015 | 22.11 | 52.84 | 12.22 |
| 2014 | 11.4 | 13.8 | 9.29 |
| 2013 | 7.98 | 15.71 | 5.33 |
| 2012 | 5.1 | 6.42 | 3.75 |
| 2011 | 7.3 | 9.64 | 3.9 |
| 2010 | 8.44 | 11.06 | 6.69 |
| 2009 | 6.39 | 10.37 | 2.56 |
| 2008 | 3.89 | 6.9 | 1.84 |
| 2007 | 4.89 | 7.75 | 2.32 |
| 2006 | 2.45 | 2.94 | 1.96 |
| 2005 | 2.05 | 2.61 | 1.52 |
| 2004 | 2.89 | 6.12 | 1.87 |
| 2003 | 3.83 | 6.15 | 2.7 |
| 2002 | 7.28 | 7.95 | 5.73 |
| 2001 | 10.49 | 12.38 | 7.97 |
| 2000 | 11.52 | 14.76 | 6.4 |
| 1999 | 5.99 | 7.48 | 4.07 |
| 1998 | 4.15 | 5.71 | 3.38 |
| 1997 | 4.11 | 6.34 | 3.02 |