| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 1.31 | 1.59 | 1.05 |
| 2024 | 1.91 | 2.83 | 1.28 |
| 2023 | 1.23 | 2.81 | 0.31 |
| 2022 | 2.63 | 3.22 | 2.27 |
| 2021 | 4.14 | 5.1 | 3 |
| 2020 | 4.83 | 5.95 | 3.66 |
| 2019 | 6.22 | 10.08 | 4.78 |
| 2018 | 5.46 | 6.53 | 4.25 |
| 2017 | 6.78 | 11.76 | 4.63 |
| 2016 | 11.74 | 14.73 | 8.87 |
| 2015 | 5.41 | 15.76 | 1.94 |
| 2014 | 1.51 | 2.21 | 1.34 |
| 2013 | 1.36 | 1.59 | 1.18 |
| 2012 | 1.29 | 1.53 | 1.04 |
| 2011 | 1.81 | 2.54 | 1.21 |
| 2010 | 1.81 | 2.62 | 1.3 |
| 2009 | 1.33 | 1.68 | 1 |
| 2008 | 1.65 | 3.86 | 0.56 |
| 2007 | 2.59 | 4.51 | 0.81 |
| 2006 | 0.83 | 1 | 0.64 |
| 2005 | 0.13 | 0.63 | 0.02 |
| 2004 | 0.03 | 0.04 | 0.02 |