| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 1.4 | 1.61 | 1.27 |
| 2024 | 1.4 | 1.74 | 1 |
| 2023 | 1.49 | 1.87 | 1.07 |
| 2022 | 1.22 | 1.63 | 1.04 |
| 2021 | 1.93 | 2.39 | 1.56 |
| 2020 | 1.88 | 2.77 | 1.19 |
| 2019 | 1.11 | 1.3 | 0.83 |
| 2018 | 1.56 | 2.27 | 0.86 |
| 2017 | 2.68 | 3.24 | 2.11 |
| 2016 | 2.91 | 3.85 | 2.49 |
| 2015 | 3.53 | 6.32 | 2.58 |
| 2014 | 2.21 | 3.37 | 1.86 |
| 2013 | 2.12 | 2.86 | 1.58 |
| 2012 | 2.11 | 3.14 | 1.55 |
| 2011 | 4.21 | 6.52 | 2 |
| 2010 | 6.7 | 9.05 | 4.94 |
| 2009 | 5.64 | 8.79 | 2.1 |
| 2008 | 4.33 | 9.28 | 1.47 |
| 2007 | 6.26 | 10.67 | 1.48 |
| 2006 | 0.8 | 1.51 | 0.33 |
| 2005 | 0.39 | 0.55 | 0.29 |
| 2004 | 0.51 | 1.1 | 0.29 |