| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2024 | 1.42 | 1.65 | 1.18 |
| 2023 | 1.71 | 2.01 | 1.38 |
| 2022 | 1.81 | 2.46 | 1.51 |
| 2021 | 3.84 | 6.58 | 2.27 |
| 2020 | 2.87 | 4.2 | 1.91 |
| 2019 | 2.13 | 2.79 | 0.85 |
| 2018 | 1.93 | 2.62 | 1.23 |
| 2017 | 2.2 | 2.83 | 1.69 |
| 2016 | 1.79 | 2.12 | 1.46 |
| 2015 | 2.21 | 2.94 | 1.66 |
| 2014 | 1.8 | 2.21 | 1.5 |
| 2013 | 2.16 | 2.67 | 1.81 |
| 2012 | 2.16 | 2.5 | 1.9 |
| 2011 | 3.46 | 5.17 | 1.91 |
| 2010 | 4.53 | 6.91 | 3.03 |
| 2009 | 4.27 | 6.59 | 2.15 |
| 2008 | 4.67 | 9.73 | 1.59 |
| 2007 | 9.46 | 12.29 | 6.95 |
| 2006 | 4.67 | 6.69 | 3.83 |
| 2005 | 4.18 | 7.57 | 2.64 |
| 2004 | 3.42 | 5.47 | 2.06 |