| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 5.85 | 7.2 | 5.32 |
| 2024 | 4.12 | 9.66 | 2.93 |
| 2023 | 3.62 | 4.3 | 2.88 |
| 2022 | 2.91 | 3.68 | 1.96 |
| 2021 | 1.7 | 2.5 | 1.14 |
| 2020 | 3.62 | 10.08 | 1.26 |
| 2019 | 2.05 | 3.73 | 1.21 |
| 2018 | 1.65 | 2.48 | 1.14 |
| 2017 | 3.1 | 5 | 1.99 |
| 2016 | 4.7 | 15.69 | 2.1 |
| 2015 | 15.56 | 25.9 | 8.41 |
| 2014 | 6.12 | 11.02 | 1.66 |
| 2013 | 1.59 | 1.91 | 1.01 |
| 2012 | 0.98 | 1.14 | 0.8 |
| 2011 | 1.27 | 1.71 | 0.8 |
| 2010 | 1.39 | 1.79 | 1.15 |
| 2009 | 1.42 | 1.81 | 0.99 |
| 2008 | 2.06 | 4.21 | 0.79 |
| 2007 | 2.49 | 5.4 | 0.67 |
| 2006 | 1.04 | 1.7 | 0.64 |
| 2005 | 1.34 | 1.74 | 1.04 |
| 2004 | 2.69 | 5.04 | 1.42 |