| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2026 | 0 | ||
| 2025 | 0 | ||
| 2024 | 0 | ||
| 2023 | 0 | ||
| 2022 | 2.19 | 4.8 | 0.27 |
| 2021 | 1.97 | 4.41 | 0.45 |
| 2020 | 3.17 | 8.54 | 0.59 |
| 2019 | 5.19 | 10.75 | 0.75 |
| 2018 | 2.91 | 4.75 | 0.99 |
| 2017 | 5.28 | 5.98 | 4.11 |
| 2016 | 53.84 | 226.35 | 5.46 |
| 2015 | 39.51 | 57.8 | 27.3 |
| 2014 | 16.04 | 30.87 | 6.44 |
| 2013 | 9.67 | 13.15 | 7.15 |
| 2012 | 9.46 | 12.22 | 6.36 |
| 2011 | 18.89 | 27.05 | 6.88 |
| 2010 | 17.54 | 30.7 | 11.34 |
| 2009 | 7.54 | 17.51 | 2.27 |
| 2008 | 3.62 | 5.63 | 1.69 |
| 2007 | 4.73 | 6.64 | 2.15 |
| 2006 | 2.11 | 2.77 | 1.55 |
| 2005 | 1.71 | 2.07 | 1.33 |
| 2004 | 2.76 | 4.15 | 1.73 |
| 2003 | 4.23 | 5.89 | 2.71 |
| 2002 | 7.28 | 8.67 | 5.81 |
| 2001 | 7.72 | 10.38 | 4.52 |
| 2000 | 4.66 | 5.93 | 3.49 |