| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2024 | 1.78 | 2.25 | 1.4 |
| 2023 | 1.62 | 1.91 | 1.39 |
| 2022 | 1.47 | 1.84 | 1.16 |
| 2021 | 2.44 | 4.5 | 1.61 |
| 2020 | 2.39 | 3.28 | 1.66 |
| 2019 | 1.69 | 2.14 | 1.21 |
| 2018 | 1.61 | 2.17 | 1.18 |
| 2017 | 2.19 | 2.75 | 1.71 |
| 2016 | 1.94 | 2.45 | 1.59 |
| 2015 | 2.37 | 4.01 | 1.67 |
| 2014 | 1.28 | 2.28 | 1.04 |
| 2013 | 1.51 | 1.96 | 1.2 |
| 2012 | 1.8 | 2.29 | 1.15 |
| 2011 | 3.1 | 4.74 | 1.74 |
| 2010 | 3 | 4.19 | 1.91 |
| 2009 | 3.08 | 3.93 | 1.71 |
| 2008 | 3.54 | 7.18 | 1.27 |
| 2007 | 6.34 | 9.61 | 3.4 |
| 2006 | 1.95 | 3.89 | 1.14 |
| 2005 | 1.28 | 2.21 | 0.84 |
| 2004 | 1.84 | 3.73 | 0.98 |