| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2024 | 2.86 | 3.59 | 2.25 |
| 2023 | 2.96 | 3.61 | 2.46 |
| 2022 | 3.06 | 4.19 | 2.22 |
| 2021 | 5.6 | 9.14 | 3.76 |
| 2020 | 4.07 | 6.59 | 2.63 |
| 2019 | 3.38 | 4.31 | 2.74 |
| 2018 | 4.42 | 6.39 | 3.28 |
| 2017 | 4.02 | 5.76 | 3.27 |
| 2016 | 3.43 | 3.96 | 2.66 |
| 2015 | 3.06 | 4.44 | 2.13 |
| 2014 | 1.49 | 2.47 | 1.18 |
| 2013 | 1.42 | 1.73 | 1.24 |
| 2012 | 1.65 | 2.15 | 1.24 |
| 2011 | 2.33 | 3.21 | 1.34 |
| 2010 | 2.43 | 3.15 | 1.95 |
| 2009 | 1.99 | 2.72 | 1.45 |
| 2008 | 2.84 | 5.26 | 1.19 |
| 2007 | 3.35 | 5.09 | 1.8 |
| 2006 | 1.76 | 2.4 | 1.34 |
| 2005 | 1.42 | 1.76 | 0.92 |
| 2004 | 1.76 | 3.59 | 0.92 |