| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 2.13 | 2.59 | 1.95 |
| 2024 | 1.25 | 3.16 | 0.8 |
| 2023 | 1.13 | 1.47 | 0.98 |
| 2022 | 1.14 | 1.57 | 0.9 |
| 2021 | 1.6 | 2.08 | 1.28 |
| 2020 | 1.08 | 1.76 | 0.91 |
| 2019 | 1.19 | 1.72 | 1.01 |
| 2018 | 1.52 | 2.35 | 1.06 |
| 2017 | 2.71 | 3.2 | 2.25 |
| 2016 | 3.04 | 4.04 | 2.71 |
| 2015 | 4.5 | 6.97 | 3.09 |
| 2014 | 3.15 | 4.18 | 2.42 |
| 2013 | 2.45 | 3.83 | 1.48 |
| 2012 | 1.49 | 1.77 | 1.18 |
| 2011 | 1.83 | 2.33 | 1.44 |
| 2010 | 1.38 | 2.27 | 0.94 |
| 2009 | 1.14 | 1.67 | 0.49 |
| 2008 | 0.9 | 1.79 | 0.38 |
| 2007 | 1.41 | 2.1 | 0.59 |
| 2006 | 0.77 | 1.03 | 0.55 |
| 2005 | 1.55 | 2.58 | 0.85 |
| 2004 | 3.83 | 6.33 | 1.56 |