| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2024 | 2.74 | 3.21 | 2.38 |
| 2023 | 3.47 | 4.38 | 2.92 |
| 2022 | 5.11 | 7.35 | 3.57 |
| 2021 | 7.26 | 9.37 | 5.11 |
| 2020 | 7.42 | 11.07 | 4.34 |
| 2019 | 5.2 | 6.02 | 4.6 |
| 2018 | 6.45 | 8.36 | 4.16 |
| 2017 | 5.9 | 8.19 | 4.3 |
| 2016 | 4.24 | 4.96 | 3.08 |
| 2015 | 3.26 | 4.82 | 2.22 |
| 2014 | 2.01 | 2.41 | 1.66 |
| 2013 | 2.04 | 2.54 | 1.72 |
| 2012 | 3.05 | 4.12 | 1.57 |
| 2011 | 6.66 | 10.06 | 3.56 |
| 2010 | 9.13 | 10.71 | 8.05 |
| 2009 | 5.91 | 8.81 | 3.55 |
| 2008 | 4.87 | 10.56 | 2.47 |
| 2007 | 7.49 | 12.71 | 3.99 |
| 2006 | 2.91 | 4.35 | 2.01 |
| 2005 | 1.84 | 2.14 | 1.6 |
| 2004 | 2.22 | 2.76 | 1.79 |
| 2003 | 2.51 | 3.12 | 1.93 |
| 2002 | 4.29 | 4.74 | 3.93 |
| 2001 | 5.94 | 7.07 | 4.25 |