| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 1.41 | 1.76 | 1.19 |
| 2024 | 1.36 | 1.71 | 1.12 |
| 2023 | 1.35 | 1.71 | 0.97 |
| 2022 | 1.64 | 2.53 | 1.12 |
| 2021 | 3.62 | 6.04 | 2.13 |
| 2020 | 6.23 | 19.39 | 2.18 |
| 2019 | 4.78 | 6.66 | 3.12 |
| 2018 | 2.9 | 3.58 | 2.23 |
| 2017 | 5.03 | 7.09 | 3.12 |
| 2016 | 5.5 | 7.67 | 3.53 |
| 2015 | 4.96 | 9.69 | 3.15 |
| 2014 | 3.18 | 4.19 | 2.45 |
| 2013 | 2.3 | 2.92 | 1.65 |
| 2012 | 1.9 | 2.53 | 1.45 |
| 2011 | 3.13 | 4.25 | 1.99 |
| 2010 | 3.69 | 4.63 | 2.68 |
| 2009 | 2.8 | 4.4 | 1.28 |
| 2008 | 3.16 | 7.46 | 0.87 |
| 2007 | 4.16 | 6.18 | 2.02 |
| 2006 | 1.98 | 2.69 | 1.52 |
| 2005 | 1.69 | 2.25 | 1.31 |
| 2004 | 3.12 | 6.05 | 1.6 |