| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2024 | 1.67 | 2.12 | 1.26 |
| 2023 | 1.88 | 2.71 | 1.34 |
| 2022 | 2.78 | 4.12 | 1.98 |
| 2021 | 1.63 | 3.33 | 1.01 |
| 2020 | 1.25 | 1.52 | 1.12 |
| 2019 | 1.65 | 2.1 | 1.39 |
| 2018 | 2.21 | 2.66 | 1.71 |
| 2017 | 2.07 | 2.55 | 1.87 |
| 2016 | 2.12 | 3 | 1.91 |
| 2015 | 4.1 | 6.23 | 2.83 |
| 2014 | 4.17 | 5.64 | 3.43 |
| 2013 | 7.2 | 9.39 | 5.12 |
| 2012 | 6.85 | 7.92 | 5.47 |
| 2011 | 9.97 | 14.49 | 5.9 |
| 2010 | 10.98 | 16.64 | 7.54 |
| 2009 | 5.2 | 7.53 | 3 |
| 2008 | 4.38 | 8.1 | 1.7 |
| 2007 | 5.4 | 8.32 | 2.41 |
| 2006 | 2.51 | 3.51 | 1.95 |
| 2005 | 2.22 | 3.16 | 1.71 |
| 2004 | 6.01 | 9.85 | 3.16 |
| 2003 | 7.14 | 8.95 | 5.11 |
| 2002 | 11.8 | 14.07 | 9.47 |
| 2001 | 15.98 | 18.78 | 13.77 |