| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2024 | 1.33 | 1.48 | 1.1 |
| 2023 | 1.53 | 1.79 | 1.31 |
| 2022 | 1.59 | 2.01 | 1.35 |
| 2021 | 1.79 | 2.12 | 1.64 |
| 2020 | 2.14 | 2.7 | 1.82 |
| 2019 | 2.68 | 3.41 | 2.2 |
| 2018 | 2.81 | 3.64 | 2.14 |
| 2017 | 2.57 | 2.85 | 2.23 |
| 2016 | 3.49 | 4.55 | 2.18 |
| 2015 | 5.22 | 7.52 | 3.92 |
| 2014 | 4.79 | 5.71 | 4.14 |
| 2013 | 7.41 | 11.63 | 4.02 |
| 2012 | 4.07 | 6.5 | 2.66 |
| 2011 | 3.74 | 5.85 | 2.41 |
| 2010 | 3.08 | 4.8 | 2.07 |
| 2009 | 2.12 | 3.63 | 1.61 |
| 2008 | 2.82 | 4.97 | 1.18 |
| 2007 | 3.89 | 4.86 | 2.33 |
| 2006 | 2.24 | 2.62 | 1.82 |
| 2005 | 1.37 | 2.06 | 0.99 |
| 2004 | 1.5 | 2.18 | 1.01 |
| 2003 | 2.21 | 2.93 | 1.67 |
| 2002 | 3.29 | 3.79 | 2.9 |