| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 1.79 | 1.87 | 1.68 |
| 2024 | 1.71 | 1.99 | 1.48 |
| 2023 | 2.15 | 2.71 | 1.78 |
| 2022 | 3.24 | 6.57 | 1.78 |
| 2021 | 4.1 | 8.05 | 0.95 |
| 2020 | 0.98 | 1.67 | 0.54 |
| 2019 | 0.6 | 0.83 | 0.48 |
| 2018 | 1.07 | 1.45 | 0.56 |
| 2017 | 1.74 | 3.11 | 0.98 |
| 2016 | 13.42 | 40.8 | 2.75 |
| 2015 | 7.28 | 9.68 | 4.1 |
| 2014 | 4.21 | 5.19 | 3.08 |
| 2013 | 3.71 | 4.86 | 2.9 |
| 2012 | 20.65 | 44.05 | 2.35 |
| 2011 | 45.21 | 57.41 | 27.56 |
| 2010 | 39.86 | 62.06 | 28.24 |
| 2009 | 24.8 | 44.58 | 4.89 |
| 2008 | 10.3 | 22.44 | 3.77 |
| 2007 | 232.17 | 504.86 | 16.51 |
| 2006 | 5.12 | 5.49 | 4.72 |
| 2005 | 3.83 | 6.8 | 1.03 |
| 2004 | 2.61 | 3.75 | 1.58 |
| 2003 | 3.31 | 4.17 | 2.47 |