| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 1.59 | 1.91 | 1.33 |
| 2024 | 0.95 | 2.35 | 0.59 |
| 2023 | 0.78 | 0.94 | 0.67 |
| 2022 | 0.78 | 1 | 0.63 |
| 2021 | 0.82 | 1 | 0.66 |
| 2020 | 1.13 | 1.62 | 0.92 |
| 2019 | 1.5 | 2.26 | 0.91 |
| 2018 | 1.79 | 2.68 | 1.12 |
| 2017 | 2.19 | 2.91 | 1.7 |
| 2016 | 3.33 | 4.96 | 2.32 |
| 2015 | 5.25 | 8.4 | 3.45 |
| 2014 | 11.25 | 21.45 | 5.13 |
| 2013 | 8.26 | 11.49 | 5.49 |
| 2012 | 4.55 | 6.4 | 2.87 |
| 2011 | 4.77 | 6.71 | 3.03 |
| 2010 | 5.49 | 6.89 | 4.32 |
| 2009 | 3.05 | 5.86 | 1.44 |
| 2008 | 2.81 | 5.71 | 1.16 |
| 2007 | 6.09 | 8.81 | 3.94 |
| 2006 | 3.04 | 4.14 | 2.08 |
| 2005 | 2.28 | 3.61 | 1.7 |
| 2004 | 4.88 | 9.8 | 2.43 |