| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 5.11 | 6.08 | 4.16 |
| 2024 | 2.94 | 5.71 | 1.7 |
| 2023 | 2.76 | 3.41 | 2.28 |
| 2022 | 2.97 | 4.24 | 2.11 |
| 2021 | 2.84 | 5 | 1.95 |
| 2020 | 2.51 | 3.28 | 2.1 |
| 2019 | 2.7 | 3.26 | 2.13 |
| 2018 | 2.51 | 3.46 | 1.79 |
| 2017 | 3.52 | 4.18 | 2.8 |
| 2016 | 5.01 | 6.51 | 3.71 |
| 2015 | 5.98 | 9.4 | 3.14 |
| 2014 | 4.76 | 6.46 | 3.03 |
| 2013 | 2.9 | 3.69 | 1.74 |
| 2012 | 2.18 | 3.11 | 1.53 |
| 2011 | 3.13 | 4.5 | 2.23 |
| 2010 | 3.63 | 4.6 | 2.47 |
| 2009 | 2.56 | 3.45 | 1.86 |
| 2008 | 3.17 | 7.24 | 1.48 |
| 2007 | 4.98 | 9.26 | 2.52 |
| 2006 | 3.08 | 3.95 | 2.51 |
| 2005 | 2.3 | 2.94 | 1.7 |