| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 4.15 | 4.51 | 3.92 |
| 2024 | 4.48 | 5.52 | 3.43 |
| 2023 | 3.49 | 4.12 | 3.08 |
| 2022 | 3.15 | 4.36 | 2.49 |
| 2021 | 2.54 | 4 | 1.93 |
| 2020 | 2.46 | 3.07 | 2.09 |
| 2019 | 2.32 | 2.82 | 1.96 |
| 2018 | 2.42 | 2.84 | 1.97 |
| 2017 | 3.13 | 3.63 | 2.51 |
| 2016 | 3.59 | 4.45 | 3.07 |
| 2015 | 3.67 | 5.04 | 2.61 |
| 2014 | 3.73 | 5.16 | 2.92 |
| 2013 | 3.78 | 4.78 | 2.85 |
| 2012 | 3.05 | 3.81 | 2.35 |
| 2011 | 3.55 | 4.11 | 2.74 |
| 2010 | 3.97 | 4.99 | 2.64 |
| 2009 | 3.16 | 4.5 | 2.33 |
| 2008 | 3.2 | 6.77 | 1.51 |
| 2007 | 4.17 | 7.67 | 1.24 |
| 2006 | 1.18 | 1.4 | 0.9 |
| 2005 | 1.2 | 1.53 | 0.89 |
| 2004 | 1.85 | 2.56 | 1.42 |
| 2003 | 2.5 | 3.21 | 1.98 |
| 2002 | 3.92 | 4.32 | 3.43 |
| 2001 | 4.8 | 5.88 | 3.47 |