| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2024 | 2.21 | 2.65 | 1.79 |
| 2023 | 2.88 | 3.74 | 2.03 |
| 2022 | 3.83 | 5.26 | 2.98 |
| 2021 | 5.28 | 6.53 | 4.34 |
| 2020 | 4.23 | 5.63 | 2.82 |
| 2019 | 2.81 | 3.72 | 2.34 |
| 2018 | 3.14 | 4.25 | 2.23 |
| 2017 | 3.87 | 4.38 | 3.38 |
| 2016 | 3.46 | 4.23 | 2.45 |
| 2015 | 3.89 | 5.62 | 2.62 |
| 2014 | 2.75 | 3.63 | 1.52 |
| 2013 | 4.26 | 25.71 | 1.39 |
| 2012 | 5.76 | 21.39 | 1.8 |
| 2011 | 2.35 | 2.98 | 1.79 |
| 2010 | 2.19 | 3.09 | 1.52 |
| 2009 | 2.38 | 2.98 | 1.71 |
| 2008 | 2.71 | 4.45 | 1.15 |
| 2007 | 3.57 | 5.71 | 1.64 |
| 2006 | 2.44 | 3.32 | 1.49 |
| 2005 | 2.02 | 3.26 | 1 |
| 2004 | 2.06 | 4.09 | 1.1 |