| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 6.35 | 7.13 | 6.02 |
| 2024 | 5.93 | 8.64 | 4.58 |
| 2023 | 7.41 | 8.43 | 6.28 |
| 2022 | 6.71 | 8 | 5.53 |
| 2021 | 7.75 | 12.01 | 5.29 |
| 2020 | 3.89 | 10.76 | 2.44 |
| 2019 | 3.22 | 3.83 | 2.58 |
| 2018 | 3.58 | 5.05 | 2.36 |
| 2017 | 5.46 | 6.2 | 4.7 |
| 2016 | 5.01 | 6.59 | 4.26 |
| 2015 | 6.52 | 12.16 | 4.6 |
| 2014 | 4.28 | 5.05 | 3.36 |
| 2013 | 3.72 | 4.45 | 3.07 |
| 2012 | 4.9 | 6.43 | 3.32 |
| 2011 | 5.1 | 6.06 | 3.73 |
| 2010 | 6.45 | 7.57 | 4.88 |
| 2009 | 2.59 | 6.39 | 0.71 |
| 2008 | 1.11 | 2.14 | 0.58 |
| 2007 | 2.02 | 2.61 | 1.05 |
| 2006 | 0.98 | 1.32 | 0.65 |
| 2005 | 0.74 | 0.95 | 0.42 |
| 2004 | 0.61 | 0.94 | 0.42 |