| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 3.78 | 4.34 | 3.35 |
| 2024 | 2.99 | 4.75 | 1.8 |
| 2023 | 2.77 | 3.63 | 2.08 |
| 2022 | 2.29 | 2.68 | 1.64 |
| 2021 | 1.87 | 2.78 | 1.65 |
| 2020 | 1.98 | 2.65 | 1.66 |
| 2019 | 1.72 | 2.28 | 1.18 |
| 2018 | 1.62 | 2.4 | 1.12 |
| 2017 | 3.06 | 4.28 | 2.3 |
| 2016 | 3.69 | 5.4 | 3.28 |
| 2015 | 5.86 | 11.9 | 2.76 |
| 2014 | 3.84 | 5.28 | 2.84 |
| 2013 | 2.78 | 3.71 | 2.24 |
| 2012 | 2.89 | 3.59 | 2.41 |
| 2011 | 3.89 | 4.9 | 2.68 |
| 2010 | 3.83 | 5.61 | 2.78 |
| 2009 | 2.89 | 4.03 | 1.55 |
| 2008 | 3.09 | 6.81 | 1.2 |
| 2007 | 7.14 | 13.11 | 3.88 |
| 2006 | 5.59 | 8.42 | 3.06 |
| 2005 | 2.75 | 3.35 | 1.58 |
| 2004 | 3.48 | 4.74 | 2.94 |
| 2003 | 4.77 | 5.51 | 4.33 |
| 2002 | 7.16 | 8.1 | 4.39 |