| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2024 | 1.7 | 2.04 | 1.38 |
| 2023 | 2.18 | 2.69 | 1.77 |
| 2022 | 1.8 | 2.52 | 1.45 |
| 2021 | 1.86 | 2.23 | 1.56 |
| 2020 | 2.26 | 2.95 | 1.93 |
| 2019 | 2.19 | 2.83 | 1.6 |
| 2018 | 2.13 | 2.49 | 1.64 |
| 2017 | 3 | 3.68 | 2.28 |
| 2016 | 3.9 | 6.41 | 3.01 |
| 2015 | 5.15 | 6.41 | 3.45 |
| 2014 | 4.83 | 6.26 | 3.35 |
| 2013 | 3.67 | 4.94 | 2.17 |
| 2012 | 3 | 6.5 | 1.79 |
| 2011 | 6.6 | 8.56 | 5.19 |
| 2010 | 4.57 | 6.06 | 3.28 |
| 2009 | 2.76 | 3.86 | 1.9 |
| 2008 | 2.55 | 5.04 | 1.28 |
| 2007 | 3.32 | 4.51 | 1.97 |
| 2006 | 2.1 | 2.62 | 1.78 |
| 2005 | 2.18 | 2.63 | 1.78 |