| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 3.64 | 3.88 | 3.18 |
| 2024 | 3.12 | 5.18 | 1.5 |
| 2023 | 1.78 | 2.62 | 1.4 |
| 2022 | 1.46 | 1.83 | 0.99 |
| 2021 | 1.48 | 2.09 | 1.12 |
| 2020 | 2.07 | 2.61 | 1.57 |
| 2019 | 2.18 | 3.89 | 1.54 |
| 2018 | 2.05 | 2.47 | 1.64 |
| 2017 | 1.96 | 2.34 | 1.56 |
| 2016 | 1.91 | 2.48 | 1.43 |
| 2015 | 2.84 | 4.66 | 1.15 |
| 2014 | 0.92 | 1.63 | 0.6 |
| 2013 | 0.75 | 0.92 | 0.63 |
| 2012 | 0.68 | 0.88 | 0.53 |
| 2011 | 1.25 | 1.57 | 0.72 |
| 2010 | 1.57 | 2.14 | 1.2 |
| 2009 | 1.74 | 2.44 | 1.06 |
| 2008 | 2.18 | 4.7 | 0.79 |
| 2007 | 2.79 | 4.44 | 1.16 |
| 2006 | 1.12 | 1.38 | 0.87 |
| 2005 | 0.96 | 1.28 | 0.71 |
| 2004 | 3.17 | 4.96 | 1.03 |