| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 1.85 | 2 | 1.7 |
| 2024 | 2.11 | 2.5 | 1.46 |
| 2023 | 2.14 | 2.75 | 1.67 |
| 2022 | 2.18 | 2.73 | 1.46 |
| 2021 | 1.85 | 3.16 | 1.49 |
| 2020 | 2 | 2.42 | 1.75 |
| 2019 | 2.12 | 3.54 | 1.58 |
| 2018 | 1.69 | 2.05 | 1.39 |
| 2017 | 2.14 | 2.37 | 1.72 |
| 2016 | 2.43 | 3.28 | 2.17 |
| 2015 | 3.47 | 6.04 | 2.27 |
| 2014 | 2.14 | 3.29 | 1.51 |
| 2013 | 1.97 | 2.6 | 1.54 |
| 2012 | 2.82 | 3.78 | 2.11 |
| 2011 | 4.68 | 6.06 | 2.7 |
| 2010 | 5.68 | 7.39 | 4.5 |
| 2009 | 4.92 | 6.25 | 3.33 |
| 2008 | 5.69 | 10.52 | 2.38 |
| 2007 | 7.82 | 13.24 | 3.48 |
| 2006 | 3.72 | 4.86 | 2.87 |
| 2005 | 3.76 | 4.52 | 2.97 |
| 2004 | 7.3 | 11.28 | 4.46 |