| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2024 | 1.07 | 1.32 | 0.82 |
| 2023 | 1.34 | 2.06 | 0.95 |
| 2022 | 2.65 | 3.94 | 1.63 |
| 2021 | 2.84 | 5.91 | 1.49 |
| 2020 | 1.34 | 1.78 | 1.1 |
| 2019 | 1.1 | 1.39 | 0.91 |
| 2018 | 1.25 | 1.66 | 0.97 |
| 2017 | 1.32 | 1.79 | 1 |
| 2016 | 1.28 | 1.63 | 1.05 |
| 2015 | 1.64 | 2.43 | 1.15 |
| 2014 | 1.51 | 1.99 | 1.2 |
| 2013 | 2.21 | 4.23 | 1.41 |
| 2012 | 3.71 | 4.54 | 2.59 |
| 2011 | 4.55 | 5.63 | 3.16 |
| 2010 | 4.64 | 6.12 | 3.39 |
| 2009 | 4.01 | 5.64 | 2.34 |
| 2008 | 5.45 | 9.12 | 1.54 |
| 2007 | 3.94 | 6.06 | 2.1 |
| 2006 | 1.89 | 2.25 | 1.51 |
| 2005 | 1.53 | 1.96 | 1.19 |
| 2004 | 2.38 | 3.66 | 1.71 |
| 2003 | 3.01 | 3.91 | 2.19 |
| 2002 | 4.64 | 5.22 | 3.83 |
| 2001 | 6.28 | 7.45 | 4.97 |
| 2000 | 5.96 | 7.23 | 5.01 |