| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 1.94 | 2.17 | 1.69 |
| 2024 | 1.95 | 3 | 1.42 |
| 2023 | 1.59 | 2.78 | 0.47 |
| 2022 | 0.63 | 1.06 | 0.41 |
| 2021 | 0.85 | 1.31 | 0.65 |
| 2020 | 0.76 | 1.14 | 0.54 |
| 2019 | 0.55 | 0.77 | 0.31 |
| 2018 | 0.46 | 0.78 | 0.28 |
| 2017 | 0.84 | 1.06 | 0.64 |
| 2016 | 1.13 | 2.08 | 0.81 |
| 2015 | 2.21 | 3.3 | 1.52 |
| 2014 | 2.17 | 3.99 | 1.21 |
| 2013 | 9.99 | 23.42 | 3.87 |
| 2012 | 33.88 | 68.78 | 14.96 |
| 2011 | 22.71 | 41.6 | 5.35 |
| 2010 | 8.96 | 19.72 | 4.62 |
| 2009 | 23.24 | 39.43 | 14.21 |
| 2008 | 63.35 | 338.94 | 7.92 |
| 2007 | 54.9 | 247.55 | 23.92 |
| 2006 | 14.6 | 23.92 | 7.46 |
| 2005 | 8.76 | 11.19 | 6.99 |
| 2004 | 9.07 | 15.06 | 6.96 |