| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 2.37 | 2.78 | 1.97 |
| 2024 | 1.96 | 3.06 | 1.32 |
| 2023 | 2.86 | 4.17 | 2.22 |
| 2022 | 3.46 | 6.12 | 2.58 |
| 2021 | 2.03 | 2.43 | 1.66 |
| 2020 | 3.2 | 4.8 | 2.11 |
| 2019 | 3.12 | 4.46 | 2.02 |
| 2018 | 2.88 | 4.1 | 1.96 |
| 2017 | 4.72 | 6.64 | 2.81 |
| 2016 | 7.58 | 9.93 | 5 |
| 2015 | 8.47 | 17.17 | 4.35 |
| 2014 | 5.73 | 22.33 | 3.33 |
| 2013 | 3.03 | 4.11 | 2.07 |
| 2012 | 2.57 | 3.61 | 1.84 |
| 2011 | 3.79 | 4.81 | 3.58 |
| 2010 | 3.84 | 4.85 | 2.72 |
| 2009 | 2.64 | 3.83 | 1.48 |
| 2008 | 2.44 | 4.7 | 1.17 |
| 2007 | 4.09 | 5.49 | 2.89 |
| 2006 | 2.9 | 3.88 | 2.27 |
| 2005 | 2.22 | 2.7 | 1.68 |
| 2004 | 4.38 | 7.97 | 2.56 |
| 2003 | 9.04 | 13.97 | 6.45 |
| 2002 | 13.47 | 15.79 | 11.95 |
| 2001 | 12.94 | 14.66 | 8.84 |
| 2000 | 9.17 | 13.84 | 5.78 |
| 1999 | 4.99 | 6.35 | 3.74 |