| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 2.28 | 2.66 | 1.95 |
| 2024 | 2.24 | 3.21 | 1.51 |
| 2023 | 2.9 | 3.82 | 2.55 |
| 2022 | 2.47 | 3.75 | 1.92 |
| 2021 | 2.47 | 3.67 | 1.75 |
| 2020 | 2.11 | 3.65 | 1.62 |
| 2019 | 2.02 | 2.56 | 1.6 |
| 2018 | 1.99 | 3.05 | 1.4 |
| 2017 | 3.63 | 4.96 | 2.75 |
| 2016 | 3.95 | 5.63 | 3.03 |
| 2015 | 3.71 | 6.26 | 2.31 |
| 2014 | 2.6 | 3.32 | 2.15 |
| 2013 | 2.27 | 2.85 | 1.81 |
| 2012 | 2.27 | 2.86 | 1.74 |
| 2011 | 3.34 | 4.51 | 1.82 |
| 2010 | 3.79 | 4.91 | 2.82 |
| 2009 | 3.78 | 5.02 | 2.26 |
| 2008 | 4.4 | 7.65 | 1.58 |
| 2007 | 5.35 | 7.9 | 2.22 |
| 2006 | 2.06 | 2.7 | 1.39 |
| 2005 | 1.49 | 1.99 | 1.09 |
| 2004 | 2.28 | 2.99 | 1.86 |
| 2003 | 3.22 | 3.83 | 2.14 |
| 2002 | 3.77 | 4.54 | 2.44 |
| 2001 | 3.53 | 4.32 | 2.25 |
| 2000 | 3.38 | 3.75 | 2.9 |