| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 2.23 | 3.07 | 1.72 |
| 2024 | 1.97 | 2.39 | 1.43 |
| 2023 | 2.29 | 2.74 | 1.99 |
| 2022 | 2.43 | 3.82 | 1.94 |
| 2021 | 2.14 | 3.23 | 1.72 |
| 2020 | 2.52 | 3.19 | 2.14 |
| 2019 | 2.95 | 3.82 | 2.57 |
| 2018 | 3.21 | 4.28 | 2.14 |
| 2017 | 4.77 | 6.58 | 3.2 |
| 2016 | 4.76 | 5.68 | 4.13 |
| 2015 | 4.99 | 7.64 | 2.9 |
| 2014 | 2.6 | 4.19 | 1.89 |
| 2013 | 2.4 | 2.84 | 1.99 |
| 2012 | 2.52 | 3.23 | 1.97 |
| 2011 | 4.13 | 5.24 | 2.64 |
| 2010 | 3.27 | 4.74 | 2.19 |
| 2009 | 2.65 | 3.9 | 1.65 |
| 2008 | 2.04 | 3.69 | 1.13 |
| 2007 | 3.1 | 4.19 | 2.24 |
| 2006 | 2.13 | 3.28 | 0.93 |
| 2005 | 1.02 | 1.4 | 0.73 |
| 2004 | 1.85 | 2.61 | 1.32 |
| 2003 | 2.73 | 3.51 | 1.97 |
| 2002 | 3.57 | 4.12 | 2.81 |
| 2001 | 4.65 | 5.44 | 3.13 |