| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 1.14 | 1.27 | 1.01 |
| 2024 | 1.16 | 1.48 | 0.91 |
| 2023 | 1.53 | 2.04 | 1.17 |
| 2022 | 1.31 | 2 | 1.03 |
| 2021 | 1.75 | 2.79 | 0.99 |
| 2020 | 1.08 | 1.47 | 0.93 |
| 2019 | 1.44 | 2.08 | 1.11 |
| 2018 | 1.42 | 1.96 | 1.04 |
| 2017 | 2.92 | 5.32 | 1.64 |
| 2016 | 3.05 | 3.84 | 2.43 |
| 2015 | 5.55 | 9.53 | 3.29 |
| 2014 | 12.12 | 46.98 | 4.42 |
| 2013 | 3.89 | 5.62 | 2.7 |
| 2012 | 3.32 | 4.57 | 2.25 |
| 2011 | 4.2 | 5.79 | 3.29 |
| 2010 | 2.86 | 5.09 | 1.77 |
| 2009 | 2.07 | 2.66 | 1.19 |
| 2008 | 1.7 | 2.79 | 0.96 |
| 2007 | 2.91 | 4.81 | 1.63 |
| 2006 | 1.82 | 3.14 | 1.13 |
| 2005 | 0.99 | 1.22 | 0.74 |
| 2004 | 1.29 | 1.82 | 0.83 |
| 2003 | 1.62 | 1.88 | 1.43 |
| 2002 | 2.17 | 2.43 | 1.61 |
| 2001 | 2.82 | 3.43 | 2.02 |
| 2000 | 2.49 | 3.06 | 2.02 |