| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 1.15 | 1.33 | 1.01 |
| 2024 | 0.95 | 1.69 | 0.73 |
| 2023 | 1.2 | 1.56 | 1.05 |
| 2022 | 1.26 | 1.43 | 1.05 |
| 2021 | 1.38 | 1.53 | 1.23 |
| 2020 | 1.51 | 1.94 | 1.27 |
| 2019 | 1.6 | 2.51 | 1.27 |
| 2018 | 2.02 | 3.1 | 1.29 |
| 2017 | 3.23 | 4 | 2.6 |
| 2016 | 4.12 | 5.48 | 3.43 |
| 2015 | 5.28 | 13.33 | 2.62 |
| 2014 | 2.75 | 4.84 | 2.03 |
| 2013 | 3.06 | 3.94 | 2.41 |
| 2012 | 3.38 | 4.93 | 2.34 |
| 2011 | 6.44 | 8.7 | 3.54 |
| 2010 | 5.49 | 6.92 | 3.97 |
| 2009 | 5.71 | 7.91 | 2.88 |
| 2008 | 29.07 | 96.79 | 2.03 |
| 2007 | 10.78 | 25.43 | 3.93 |
| 2006 | 3.86 | 4.86 | 2.92 |
| 2005 | 2.27 | 4.76 | 1.02 |
| 2004 | 1.19 | 1.98 | 0.6 |
| 2003 | 2.36 | 3.75 | 1.42 |