| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 1.82 | 1.92 | 1.75 |
| 2024 | 2.27 | 3.25 | 1.65 |
| 2023 | 2.33 | 3.02 | 1.87 |
| 2022 | 2.46 | 3.19 | 1.91 |
| 2021 | 2.13 | 3.19 | 1.57 |
| 2020 | 3.19 | 3.88 | 2.52 |
| 2019 | 4.44 | 6.13 | 3.01 |
| 2018 | 7.74 | 10.38 | 5.38 |
| 2017 | 7.67 | 9.04 | 6.56 |
| 2016 | 7.25 | 8.58 | 6.18 |
| 2015 | 8.49 | 12.1 | 6.69 |
| 2014 | 17.28 | 43.91 | 7 |
| 2013 | 3.2 | 30.47 | 1.72 |
| 2012 | 1.91 | 2.46 | 1.44 |
| 2011 | 2.78 | 3.42 | 1.68 |
| 2010 | 2.4 | 3.14 | 1.83 |
| 2009 | 1.67 | 2.24 | 1 |
| 2008 | 1.49 | 2.78 | 0.76 |
| 2007 | 1.77 | 2.61 | 1.02 |
| 2006 | 1.01 | 1.14 | 0.79 |
| 2005 | 1.02 | 1.33 | 0.79 |
| 2004 | 1.56 | 2.18 | 1.19 |
| 2003 | 2.42 | 2.82 | 1.49 |
| 2002 | 4.66 | 11.07 | 2.58 |