| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 1.61 | 1.81 | 1.44 |
| 2024 | 1.26 | 1.84 | 0.84 |
| 2023 | 1.2 | 1.56 | 0.87 |
| 2022 | 1.19 | 1.91 | 0.91 |
| 2021 | 1.63 | 2.42 | 1.1 |
| 2020 | 2.19 | 3.06 | 1.7 |
| 2019 | 2.24 | 3.16 | 1.73 |
| 2018 | 3.54 | 4.64 | 2.27 |
| 2017 | 5.53 | 5.99 | 4.05 |
| 2016 | 3.72 | 5.62 | 2.3 |
| 2015 | 4.46 | 7.31 | 2.59 |
| 2014 | 1.55 | 3.77 | 0.88 |
| 2013 | 1.19 | 1.66 | 0.95 |
| 2012 | 1.22 | 1.7 | 0.95 |
| 2011 | 2.02 | 2.88 | 1.08 |
| 2010 | 2.12 | 2.93 | 1.45 |
| 2009 | 1.91 | 2.71 | 1.39 |
| 2008 | 1.87 | 3.76 | 0.98 |
| 2007 | 2.69 | 4.14 | 1.1 |
| 2006 | 1.22 | 1.64 | 1.03 |
| 2005 | 1.23 | 1.64 | 0.94 |
| 2004 | 2.08 | 3.96 | 1.2 |