| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 1.96 | 2.13 | 1.81 |
| 2024 | 1.91 | 2.48 | 1.26 |
| 2023 | 1.61 | 2.29 | 0.73 |
| 2022 | 0.77 | 1.17 | 0.49 |
| 2021 | 0.52 | 0.66 | 0.44 |
| 2020 | 0.72 | 1.14 | 0.47 |
| 2019 | 3.23 | 7.04 | 1.08 |
| 2018 | 4.7 | 6.45 | 2.86 |
| 2017 | 8.36 | 11.09 | 6.45 |
| 2016 | 10.33 | 13.1 | 8.31 |
| 2015 | 20.4 | 45.78 | 10.96 |
| 2014 | 66.79 | 166.27 | 26.87 |
| 2013 | 30.35 | 54.84 | 24.11 |
| 2012 | 227.62 | 340.75 | 19.14 |
| 2011 | 280.53 | 340.75 | 189.11 |
| 2010 | 196.87 | 292.84 | 141 |
| 2009 | 148.42 | 252.6 | 66.85 |
| 2008 | 56 | 106.59 | 19.89 |
| 2007 | 44.85 | 148.9 | 19.89 |
| 2006 | 12.55 | 52.14 | 0.65 |
| 2005 | 0.29 | 0.94 | 0.04 |
| 2004 | 0.27 | 0.43 | 0.16 |