| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 2.39 | 3.04 | 1.95 |
| 2024 | 2.11 | 3.29 | 1.42 |
| 2023 | 1.78 | 2.39 | 1.49 |
| 2022 | 1.48 | 1.72 | 1.18 |
| 2021 | 1.52 | 1.79 | 1.33 |
| 2020 | 2.08 | 2.95 | 1.7 |
| 2019 | 2.65 | 4.26 | 2.06 |
| 2018 | 3.14 | 4.44 | 1.94 |
| 2017 | 3.32 | 4.4 | 2.68 |
| 2016 | 3.32 | 3.97 | 2.48 |
| 2015 | 3.28 | 5.1 | 2 |
| 2014 | 2.61 | 3.34 | 2.09 |
| 2013 | 2.53 | 3.74 | 1.94 |
| 2012 | 2.08 | 3.06 | 1.6 |
| 2011 | 2.68 | 3.27 | 1.82 |
| 2010 | 3.22 | 3.99 | 2.63 |
| 2009 | 1.9 | 2.75 | 1.22 |
| 2008 | 1.75 | 2.88 | 0.86 |
| 2007 | 2.26 | 3.26 | 1.44 |
| 2006 | 1.57 | 2.13 | 1.16 |
| 2005 | 1.47 | 2.15 | 1 |
| 2004 | 2.33 | 2.95 | 1.69 |
| 2003 | 2.57 | 3.08 | 1.85 |
| 2002 | 5.1 | 6.63 | 3.9 |
| 2001 | 9.07 | 12.39 | 6.31 |