| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 7.52 | 11.03 | 5.93 |
| 2024 | 7.9 | 17.5 | 4.13 |
| 2023 | 6.3 | 8.87 | 4.42 |
| 2022 | 4.05 | 5.93 | 3.01 |
| 2021 | 3.65 | 5.44 | 2.61 |
| 2020 | 6.28 | 9.02 | 4.05 |
| 2019 | 4.68 | 6.12 | 3.12 |
| 2018 | 2.66 | 3.96 | 1.64 |
| 2017 | 2.01 | 2.85 | 1.44 |
| 2016 | 2.92 | 4.61 | 2.17 |
| 2015 | 4.44 | 8.95 | 2.61 |
| 2014 | 2.67 | 3.57 | 2.02 |
| 2013 | 2.25 | 2.84 | 1.78 |
| 2012 | 3.54 | 4.37 | 2.29 |
| 2011 | 4.09 | 5.26 | 2.93 |
| 2010 | 3.12 | 4.04 | 2.48 |
| 2009 | 2.01 | 3.35 | 0.63 |
| 2008 | 0.67 | 1 | 0.37 |
| 2007 | 0.72 | 1.14 | 0.35 |
| 2006 | 0.23 | 0.4 | 0.11 |
| 2005 | 0.15 | 0.26 | 0.08 |
| 2004 | 0.2 | 0.32 | 0.13 |