| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 1.85 | 2.22 | 1.67 |
| 2024 | 2.24 | 2.51 | 1.73 |
| 2023 | 2.72 | 3.58 | 2.14 |
| 2022 | 2.54 | 3.52 | 1.62 |
| 2021 | 2.52 | 3.25 | 2.1 |
| 2020 | 1.63 | 2.84 | 0.83 |
| 2019 | 1.13 | 1.54 | 0.72 |
| 2018 | 1.11 | 1.73 | 0.64 |
| 2017 | 1.76 | 2.44 | 1.53 |
| 2016 | 1.63 | 2.85 | 1.27 |
| 2015 | 4.89 | 9.15 | 2.42 |
| 2014 | 3.58 | 4.94 | 2.26 |
| 2013 | 1.47 | 2.73 | 1.04 |
| 2012 | 1.15 | 1.37 | 0.95 |
| 2011 | 1.84 | 2.82 | 1.03 |
| 2010 | 1.71 | 2.29 | 1.29 |
| 2009 | 1.64 | 2.37 | 0.9 |
| 2008 | 2.86 | 9.33 | 0.7 |
| 2007 | 6.53 | 11.39 | 2.65 |
| 2006 | 1.44 | 2.71 | 0.67 |
| 2005 | 0.48 | 0.69 | 0.25 |
| 2004 | 0.5 | 0.76 | 0.37 |