| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 1.74 | 2.5 | 1.29 |
| 2024 | 1.73 | 2.34 | 1.17 |
| 2023 | 1.91 | 2.44 | 1.34 |
| 2022 | 1.33 | 1.69 | 0.99 |
| 2021 | 2.11 | 3.37 | 1.14 |
| 2020 | 1.69 | 3.33 | 1.25 |
| 2019 | 1.97 | 2.54 | 1.61 |
| 2018 | 2.17 | 4.18 | 0.97 |
| 2017 | 27.38 | 75.37 | 3.55 |
| 2016 | 13.71 | 20.6 | 10.29 |
| 2015 | 19.27 | 46.19 | 6.28 |
| 2014 | 4.65 | 7.98 | 2.43 |
| 2013 | 2.61 | 3.13 | 2.23 |
| 2012 | 2.38 | 3.06 | 1.5 |
| 2011 | 2.67 | 3.64 | 1.63 |
| 2010 | 2.88 | 4.05 | 2.15 |
| 2009 | 2.26 | 3.23 | 1.3 |
| 2008 | 2.85 | 6.4 | 0.8 |
| 2007 | 4.66 | 7.29 | 1.73 |
| 2006 | 1.47 | 1.99 | 1.02 |
| 2005 | 0.92 | 1.41 | 0.54 |
| 2004 | 1.86 | 3.26 | 0.69 |