| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 3.82 | 9.21 | 1.01 |
| 2024 | 2.33 | 9.93 | 0.41 |
| 2023 | 0.55 | 0.86 | 0.37 |
| 2022 | 0.74 | 1.99 | 0.44 |
| 2021 | 0.72 | 1.49 | 0.24 |
| 2020 | 0.46 | 0.79 | 0.27 |
| 2019 | 0.79 | 1.15 | 0.56 |
| 2018 | 0.96 | 1.64 | 0.62 |
| 2017 | 1.63 | 2.05 | 1.37 |
| 2016 | 1.58 | 2.04 | 1.19 |
| 2015 | 2.18 | 3.36 | 1.55 |
| 2014 | 1.95 | 2.41 | 1.55 |
| 2013 | 1.31 | 1.88 | 0.94 |
| 2012 | 1.23 | 1.69 | 0.9 |
| 2011 | 2.37 | 4.57 | 1.28 |
| 2010 | 4.93 | 8.77 | 3.01 |
| 2009 | 5.57 | 9.34 | 1.65 |
| 2008 | 3.49 | 8.48 | 1.39 |
| 2007 | 6.1 | 11.04 | 2.42 |
| 2006 | 2.53 | 3.99 | 1.79 |
| 2005 | 2.3 | 3.08 | 1.28 |
| 2004 | 2.3 | 4.38 | 1.42 |