| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 2.7 | 3.37 | 2.31 |
| 2024 | 2.19 | 3.36 | 1.53 |
| 2023 | 2.16 | 2.69 | 1.47 |
| 2022 | 1.31 | 1.73 | 0.83 |
| 2021 | 1.12 | 1.64 | 0.85 |
| 2020 | 1.06 | 1.34 | 0.87 |
| 2019 | 1.22 | 1.79 | 0.89 |
| 2018 | 1.18 | 1.7 | 0.75 |
| 2017 | 2 | 2.9 | 1.51 |
| 2016 | 4.82 | 8.33 | 2.9 |
| 2015 | 8.6 | 14.87 | 4.96 |
| 2014 | 5.79 | 7.22 | 4.18 |
| 2013 | 4.25 | 5.76 | 3.02 |
| 2012 | 2.58 | 3.2 | 2.06 |
| 2011 | 4.21 | 5.73 | 2.42 |
| 2010 | 5.32 | 8.31 | 3.16 |
| 2009 | 2.32 | 4.33 | 0.78 |
| 2008 | 1.66 | 3.56 | 0.61 |
| 2007 | 2.88 | 4.74 | 0.87 |
| 2006 | 0.99 | 1.41 | 0.75 |
| 2005 | 0.93 | 1.36 | 0.69 |
| 2004 | 1.9 | 3.59 | 1.08 |