| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 1.48 | 1.64 | 1.34 |
| 2024 | 1.09 | 1.83 | 0.75 |
| 2023 | 1.48 | 2.41 | 0.97 |
| 2022 | 2.57 | 3.3 | 1.86 |
| 2021 | 4 | 6.34 | 2.29 |
| 2020 | 2.04 | 2.6 | 1.66 |
| 2019 | 2.73 | 3.55 | 2.2 |
| 2018 | 3.53 | 5.89 | 2.24 |
| 2017 | 10.33 | 19.12 | 4.23 |
| 2016 | 12.13 | 17.64 | 5.28 |
| 2015 | 8.07 | 10.91 | 4.48 |
| 2014 | 5.4 | 9.79 | 3.88 |
| 2013 | 11.24 | 24.5 | 4.93 |
| 2012 | 4.28 | 6.66 | 3.43 |
| 2011 | 10.17 | 12.95 | 4.07 |
| 2010 | 8.18 | 12.76 | 5.73 |
| 2009 | 6.03 | 8.8 | 2.29 |
| 2008 | 3.05 | 5.01 | 1.49 |
| 2007 | 3.31 | 4.67 | 2.03 |
| 2006 | 1.83 | 2.8 | 1.06 |
| 2005 | 1.19 | 1.68 | 0.71 |
| 2004 | 1.7 | 3.28 | 1.02 |