| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 0 | ||
| 2024 | 1.54 | 2.35 | 0.89 |
| 2023 | 1.8 | 3.07 | 1.12 |
| 2022 | 1.9 | 3.05 | 0.99 |
| 2021 | 2.26 | 3.81 | 1.36 |
| 2020 | 2.28 | 3.99 | 1.21 |
| 2019 | 1.41 | 1.7 | 1.11 |
| 2018 | 2.05 | 3.59 | 1.06 |
| 2017 | 3.49 | 4.23 | 2.97 |
| 2016 | 2.99 | 4.38 | 1.47 |
| 2015 | 1.82 | 3.43 | 1.04 |
| 2014 | 0.91 | 1.34 | 0.67 |
| 2013 | 0.61 | 0.73 | 0.5 |
| 2012 | 0.53 | 0.71 | 0.44 |
| 2011 | 0.91 | 1.12 | 0.53 |
| 2010 | 0.98 | 1.32 | 0.73 |
| 2009 | 0.61 | 1.1 | 0.29 |
| 2008 | 0.5 | 0.88 | 0.23 |
| 2007 | 0.8 | 1.24 | 0.46 |
| 2006 | 0.48 | 0.63 | 0.38 |
| 2005 | 0.38 | 0.5 | 0.29 |
| 2004 | 0.49 | 0.9 | 0.3 |