| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 6.51 | 10.09 | 3.97 |
| 2024 | 3.81 | 6.9 | 2.5 |
| 2023 | 4.22 | 5.21 | 3.52 |
| 2022 | 3.14 | 4.55 | 2.18 |
| 2021 | 2.21 | 2.68 | 1.86 |
| 2020 | 2.67 | 3.57 | 2.11 |
| 2019 | 3.02 | 5.97 | 2.19 |
| 2018 | 2.78 | 3.45 | 2.06 |
| 2017 | 4.71 | 7.33 | 3.19 |
| 2016 | 6.25 | 8.26 | 4 |
| 2015 | 6.58 | 10.41 | 4.06 |
| 2014 | 3.43 | 4.74 | 2.47 |
| 2013 | 2.84 | 3.31 | 2.27 |
| 2012 | 2.86 | 3.49 | 2.31 |
| 2011 | 4.24 | 5.44 | 2.57 |
| 2010 | 3.72 | 5.02 | 2.81 |
| 2009 | 3.22 | 4.41 | 1.81 |
| 2008 | 3.49 | 6.66 | 1.46 |
| 2007 | 6.09 | 11.52 | 2.14 |
| 2006 | 1.85 | 2.94 | 1.18 |
| 2005 | 1.24 | 1.57 | 0.87 |
| 2004 | 2.42 | 4.69 | 1.21 |
| 2003 | 1.99 | 2.65 | 1.48 |
| 2002 | 2.99 | 3.49 | 2.12 |
| 2001 | 4.07 | 4.74 | 2.98 |
| 2000 | 4.74 | 5.54 | 3.44 |
| 1999 | 3.69 | 5.37 | 2.62 |