| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 6.54 | 8.09 | 5.11 |
| 2024 | 3.43 | 10.63 | 1.54 |
| 2023 | 2.1 | 2.96 | 1.51 |
| 2022 | 1.64 | 2.02 | 1.3 |
| 2021 | 1.92 | 3.39 | 1.31 |
| 2020 | 2.5 | 3.69 | 1.65 |
| 2019 | 1.61 | 2.37 | 1.3 |
| 2018 | 1.87 | 2.63 | 1.14 |
| 2017 | 2.97 | 3.58 | 2.26 |
| 2016 | 3.16 | 4.56 | 2.69 |
| 2015 | 6.17 | 18.6 | 2.81 |
| 2014 | 1.84 | 3.66 | 1.17 |
| 2013 | 1.21 | 1.54 | 0.95 |
| 2012 | 1.13 | 1.42 | 0.91 |
| 2011 | 1.89 | 2.48 | 1.19 |
| 2010 | 2.68 | 3.52 | 2.02 |
| 2009 | 1.81 | 2.89 | 0.98 |
| 2008 | 1.92 | 4.19 | 0.78 |
| 2007 | 2.47 | 3.9 | 1.14 |
| 2006 | 0.92 | 1.36 | 0.76 |
| 2005 | 0.9 | 1.13 | 0.64 |
| 2004 | 1.52 | 2.19 | 1.11 |
| 2003 | 2.09 | 2.49 | 1.46 |
| 2002 | 2.97 | 3.29 | 2.25 |
| 2001 | 4.26 | 5.05 | 2.98 |