| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 2.36 | 2.74 | 1.89 |
| 2024 | 2.15 | 2.84 | 1.68 |
| 2023 | 1.88 | 2.78 | 1.1 |
| 2022 | 1.22 | 1.59 | 0.97 |
| 2021 | 2.78 | 5.56 | 1.52 |
| 2020 | 2.52 | 3.99 | 1.73 |
| 2019 | 10.2 | 25.87 | 2.41 |
| 2018 | 47.93 | 80.53 | 15.17 |
| 2017 | 30.65 | 86.76 | 14.03 |
| 2016 | 28.6 | 38.65 | 16.7 |
| 2015 | 50.74 | 99.25 | 26.56 |
| 2014 | 32.09 | 53.89 | 20.31 |
| 2013 | 16.51 | 22.05 | 13.27 |
| 2012 | 13.87 | 19.23 | 9.4 |
| 2011 | 10.72 | 15.58 | 7.49 |
| 2010 | 6.63 | 11.03 | 2.94 |
| 2009 | 1.35 | 3.53 | 0.44 |
| 2008 | 0.9 | 1.89 | 0.36 |
| 2007 | 1.36 | 2.22 | 0.56 |
| 2006 | 0.59 | 0.85 | 0.45 |
| 2005 | 0.54 | 0.8 | 0.36 |
| 2004 | 0.94 | 1.56 | 0.46 |