| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2024 | 2.04 | 2.45 | 1.8 |
| 2023 | 2.96 | 4.02 | 2.32 |
| 2022 | 4.53 | 6.69 | 3.51 |
| 2021 | 3.51 | 7.3 | 1.54 |
| 2020 | 1.84 | 2.23 | 1.63 |
| 2019 | 2 | 2.53 | 1.55 |
| 2018 | 2.27 | 3.35 | 1.52 |
| 2017 | 9.26 | 25.29 | 1.92 |
| 2016 | 30.96 | 52.3 | 22.03 |
| 2015 | 37.65 | 64.57 | 20.25 |
| 2014 | 18.06 | 26.13 | 14.72 |
| 2013 | 14.1 | 17.84 | 9.65 |
| 2012 | 6.95 | 10.73 | 2.08 |
| 2011 | 4.53 | 8.61 | 2.18 |
| 2010 | 4.7 | 8.85 | 2.78 |
| 2009 | 3.23 | 6.26 | 0.81 |
| 2008 | 0.68 | 1.41 | 0.28 |
| 2007 | 1.63 | 2.95 | 1.08 |
| 2006 | 1.04 | 1.44 | 0.38 |
| 2005 | 2.19 | 5.3 | 0.6 |
| 2004 | 0.67 | 0.79 | 0.58 |