| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 1.44 | 1.51 | 1.3 |
| 2024 | 1.52 | 1.79 | 1.24 |
| 2023 | 1.8 | 2.07 | 1.6 |
| 2022 | 1.87 | 2.28 | 1.58 |
| 2021 | 2.23 | 2.88 | 1.81 |
| 2020 | 2.74 | 3.95 | 1.76 |
| 2019 | 1.81 | 2.36 | 1.46 |
| 2018 | 2.26 | 2.79 | 1.67 |
| 2017 | 2.63 | 3.1 | 2.26 |
| 2016 | 3.2 | 4.26 | 2.85 |
| 2015 | 4.89 | 9.22 | 2.59 |
| 2014 | 2.14 | 2.94 | 1.67 |
| 2013 | 1.93 | 2.33 | 1.58 |
| 2012 | 1.89 | 2.32 | 1.41 |
| 2011 | 3.21 | 4.64 | 1.94 |
| 2010 | 4.12 | 5.06 | 2.73 |
| 2009 | 2.84 | 4.52 | 1.84 |
| 2008 | 3.02 | 6.55 | 1.06 |
| 2007 | 4.2 | 6.73 | 1.52 |
| 2006 | 1.83 | 2.26 | 1.39 |
| 2005 | 1.94 | 2.29 | 1.76 |
| 2004 | 2.91 | 5.61 | 2.04 |
| 2003 | 4.68 | 6.86 | 3.21 |
| 2002 | 4.12 | 6.04 | 2.66 |