| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 1.89 | 2.43 | 1.47 |
| 2024 | 1.49 | 2.15 | 1.12 |
| 2023 | 1.9 | 2.91 | 1.2 |
| 2022 | 1.36 | 2.03 | 1.09 |
| 2021 | 1.5 | 2.22 | 1.22 |
| 2020 | 2.01 | 3.33 | 1.23 |
| 2019 | 1.78 | 2.62 | 1.24 |
| 2018 | 1.67 | 2.52 | 1.09 |
| 2017 | 3.28 | 4.25 | 2.35 |
| 2016 | 3.47 | 4.73 | 2.01 |
| 2015 | 3.14 | 6.26 | 1.8 |
| 2014 | 2.39 | 2.77 | 2 |
| 2013 | 1.67 | 2.17 | 1.31 |
| 2012 | 1.45 | 1.83 | 1.14 |
| 2011 | 1.98 | 2.61 | 1.28 |
| 2010 | 2.04 | 2.79 | 1.59 |
| 2009 | 1.21 | 1.64 | 0.71 |
| 2008 | 1.19 | 2.11 | 0.51 |
| 2007 | 1.52 | 2.06 | 0.82 |
| 2006 | 0.86 | 1.03 | 0.71 |
| 2005 | 0.86 | 1.14 | 0.61 |
| 2004 | 1 | 1.7 | 0.68 |