| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 3.25 | 4.92 | 2.46 |
| 2024 | 2.71 | 4.81 | 1.87 |
| 2023 | 3.83 | 5.34 | 3.1 |
| 2022 | 2.46 | 3.76 | 1.2 |
| 2021 | 2.04 | 2.78 | 1.6 |
| 2020 | 3.03 | 4.05 | 2.36 |
| 2019 | 3.83 | 5.2 | 2.31 |
| 2018 | 2.54 | 3.39 | 1.79 |
| 2017 | 4.07 | 5.05 | 3.05 |
| 2016 | 5.65 | 8.12 | 4.43 |
| 2015 | 5.24 | 9.45 | 2.82 |
| 2014 | 2.74 | 3.21 | 2.36 |
| 2013 | 2.58 | 3.54 | 1.96 |
| 2012 | 2.19 | 2.63 | 1.68 |
| 2011 | 3.32 | 4.02 | 2.18 |
| 2010 | 3.51 | 4.33 | 2.68 |
| 2009 | 2.64 | 3.93 | 1.54 |
| 2008 | 2.52 | 4.77 | 1.12 |
| 2007 | 4.05 | 5.99 | 1.55 |
| 2006 | 1.51 | 1.98 | 0.92 |
| 2005 | 1.47 | 2.28 | 0.96 |
| 2004 | 2.46 | 3.6 | 1.76 |
| 2003 | 2.8 | 3.62 | 2 |
| 2002 | 4.69 | 5.21 | 3.84 |
| 2001 | 7.04 | 9.07 | 4.78 |