| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 2.13 | 2.63 | 1.79 |
| 2024 | 1.85 | 2.44 | 1.49 |
| 2023 | 2.28 | 3.18 | 1.83 |
| 2022 | 2.26 | 3.65 | 1.72 |
| 2021 | 2.49 | 3.45 | 1.91 |
| 2020 | 2.54 | 3.55 | 1.95 |
| 2019 | 1.94 | 2.9 | 1.29 |
| 2018 | 1.68 | 2.13 | 1.21 |
| 2017 | 2.57 | 3.32 | 1.98 |
| 2016 | 3.15 | 4.03 | 2.37 |
| 2015 | 4.08 | 7.4 | 2.2 |
| 2014 | 3.33 | 4.07 | 2.82 |
| 2013 | 3.63 | 5.27 | 2.95 |
| 2012 | 3.16 | 3.8 | 2.71 |
| 2011 | 4.43 | 5.58 | 2.99 |
| 2010 | 5.28 | 6.34 | 3.93 |
| 2009 | 4.04 | 6.74 | 2.1 |
| 2008 | 3 | 4.83 | 1.67 |
| 2007 | 4.59 | 7 | 2.74 |
| 2006 | 2.78 | 4.06 | 1.45 |
| 2005 | 2.67 | 3.86 | 2.07 |
| 2004 | 3.96 | 5.24 | 2.74 |
| 2003 | 4.75 | 5.2 | 4.26 |
| 2002 | 5.43 | 6.09 | 4.44 |
| 2001 | 6.48 | 7.42 | 5.38 |
| 2000 | 6.18 | 8.02 | 5.51 |