| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 1.28 | 1.61 | 1.05 |
| 2024 | 1.14 | 1.45 | 0.84 |
| 2023 | 1.52 | 1.84 | 1.25 |
| 2022 | 1.73 | 2.82 | 1.34 |
| 2021 | 1.93 | 2.49 | 1.32 |
| 2020 | 2.15 | 2.63 | 1.66 |
| 2019 | 2.79 | 3.52 | 2.14 |
| 2018 | 3.42 | 5.76 | 1.86 |
| 2017 | 6 | 8.8 | 4.29 |
| 2016 | 5.42 | 7.05 | 4.18 |
| 2015 | 4.44 | 7.02 | 2.2 |
| 2014 | 1.6 | 3.18 | 0.86 |
| 2013 | 0.95 | 1.12 | 0.78 |
| 2012 | 1.04 | 1.3 | 0.79 |
| 2011 | 1.69 | 2.2 | 1.07 |
| 2010 | 1.28 | 1.89 | 0.82 |
| 2009 | 1.13 | 1.67 | 0.68 |
| 2008 | 1.07 | 2.19 | 0.5 |
| 2007 | 2.33 | 3.32 | 1.52 |
| 2006 | 2 | 3.11 | 1.14 |
| 2005 | 1.44 | 2.33 | 1.03 |
| 2004 | 2.78 | 4.9 | 1.48 |