| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 2.14 | 2.88 | 1.55 |
| 2024 | 1.72 | 2.18 | 1.41 |
| 2023 | 3.18 | 5 | 1.85 |
| 2022 | 5.47 | 8.27 | 3.68 |
| 2021 | 4.71 | 8.73 | 3.06 |
| 2020 | 3.04 | 3.64 | 2.55 |
| 2019 | 3.16 | 4.44 | 2.74 |
| 2018 | 3.65 | 4.3 | 2.88 |
| 2017 | 3.97 | 4.65 | 3.12 |
| 2016 | 3.94 | 4.89 | 2.9 |
| 2015 | 4.32 | 6.72 | 2.48 |
| 2014 | 5.18 | 6.83 | 3.97 |
| 2013 | 6.25 | 9.65 | 2.99 |
| 2012 | 2.42 | 3.72 | 1.49 |
| 2011 | 2.36 | 3.01 | 1.45 |
| 2010 | 2.73 | 3.76 | 1.88 |
| 2009 | 3.2 | 4.22 | 2.39 |
| 2008 | 5.91 | 10.87 | 1.87 |
| 2007 | 4.35 | 8.94 | 1.52 |
| 2006 | 1.61 | 1.93 | 1.43 |
| 2005 | 1.73 | 2.32 | 1.23 |
| 2004 | 2.71 | 4.02 | 2.18 |
| 2003 | 3.85 | 5.03 | 2.6 |
| 2002 | 5.52 | 6.44 | 4.18 |