| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 1.82 | 2.25 | 1.58 |
| 2024 | 1.54 | 2.24 | 1.07 |
| 2023 | 1.79 | 2.28 | 1.5 |
| 2022 | 1.48 | 1.89 | 1.14 |
| 2021 | 1.1 | 1.4 | 0.85 |
| 2020 | 1.12 | 1.57 | 0.76 |
| 2019 | 1.05 | 1.3 | 0.87 |
| 2018 | 1.12 | 1.44 | 0.81 |
| 2017 | 1.71 | 2.26 | 1.35 |
| 2016 | 2 | 2.5 | 1.6 |
| 2015 | 2.5 | 3.33 | 1.43 |
| 2014 | 1.89 | 2.36 | 1.52 |
| 2013 | 2.4 | 3.42 | 1.8 |
| 2012 | 2.07 | 2.56 | 1.62 |
| 2011 | 2.97 | 3.88 | 2.16 |
| 2010 | 3.44 | 4.53 | 2.41 |
| 2009 | 3.56 | 4.74 | 2.3 |
| 2008 | 2.76 | 4.61 | 1.5 |
| 2007 | 4.22 | 6.14 | 2.68 |
| 2006 | 2.29 | 2.89 | 1.83 |
| 2005 | 3.05 | 5.08 | 1.95 |
| 2004 | 4.97 | 6.18 | 2.67 |
| 2003 | 4.16 | 5.59 | 3.05 |