| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 6.23 | 7.44 | 5 |
| 2024 | 3.72 | 6.14 | 2.21 |
| 2023 | 2.72 | 3.48 | 1.83 |
| 2022 | 1.01 | 2.06 | 0.77 |
| 2021 | 1.15 | 1.47 | 0.91 |
| 2020 | 1.47 | 2.19 | 1.14 |
| 2019 | 1.39 | 1.82 | 1.09 |
| 2018 | 1.22 | 1.45 | 1 |
| 2017 | 1.4 | 1.62 | 1.18 |
| 2016 | 1.53 | 1.95 | 1.14 |
| 2015 | 2.7 | 5.49 | 1.53 |
| 2014 | 1.65 | 2.5 | 1.01 |
| 2013 | 1.01 | 1.22 | 0.87 |
| 2012 | 0.95 | 1.11 | 0.82 |
| 2011 | 1.08 | 1.28 | 0.92 |
| 2010 | 1.17 | 1.4 | 0.94 |
| 2009 | 0.99 | 1.26 | 0.57 |
| 2008 | 1.07 | 2.01 | 0.49 |
| 2007 | 1.48 | 2.36 | 0.5 |
| 2006 | 0.46 | 0.56 | 0.39 |
| 2005 | 0.53 | 0.77 | 0.41 |
| 2004 | 0.68 | 1.12 | 0.36 |