| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2024 | 1.44 | 1.7 | 1.11 |
| 2023 | 1.66 | 2.13 | 1.2 |
| 2022 | 2.48 | 3.3 | 1.67 |
| 2021 | 1.48 | 2.62 | 0.93 |
| 2020 | 1.54 | 1.98 | 1.09 |
| 2019 | 1.39 | 1.86 | 1.2 |
| 2018 | 1.69 | 2.54 | 1.19 |
| 2017 | 2.46 | 3.21 | 1.93 |
| 2016 | 2.47 | 3.26 | 1.94 |
| 2015 | 2.3 | 3.7 | 1.54 |
| 2014 | 1.81 | 2.63 | 1.45 |
| 2013 | 1.49 | 1.73 | 1.18 |
| 2012 | 1.46 | 1.85 | 1.07 |
| 2011 | 3.12 | 5.31 | 1.39 |
| 2010 | 4.47 | 6.01 | 3.03 |
| 2009 | 4.51 | 6.02 | 3.06 |
| 2008 | 3.46 | 6.03 | 1.66 |
| 2007 | 4.29 | 6.08 | 2.1 |
| 2006 | 1.73 | 2.28 | 1.4 |
| 2005 | 1.66 | 2.33 | 1.2 |
| 2004 | 2.37 | 3.14 | 1.96 |
| 2003 | 4.18 | 11.39 | 2.11 |