| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 1.55 | 1.72 | 1.41 |
| 2024 | 1.53 | 1.76 | 1.29 |
| 2023 | 1.66 | 1.95 | 1.45 |
| 2022 | 2.45 | 3.21 | 1.69 |
| 2021 | 3.22 | 4.41 | 2.47 |
| 2020 | 2.02 | 3.14 | 1.29 |
| 2019 | 2.01 | 2.41 | 1.52 |
| 2018 | 2.05 | 2.45 | 1.7 |
| 2017 | 2.33 | 3.01 | 2.01 |
| 2016 | 3.41 | 4.33 | 2.8 |
| 2015 | 4.73 | 7.77 | 2.9 |
| 2014 | 9.73 | 38.41 | 2.19 |
| 2013 | 11.96 | 17.52 | 8.1 |
| 2012 | 7.93 | 9.79 | 5.84 |
| 2011 | 11.46 | 15.63 | 6.16 |
| 2010 | 8.71 | 11.89 | 6.3 |
| 2009 | 4.29 | 7.05 | 2.04 |
| 2008 | 3.34 | 5.99 | 1.63 |
| 2007 | 4.34 | 6.29 | 2.57 |
| 2006 | 2.33 | 3.2 | 1.62 |
| 2005 | 1.89 | 2.61 | 1.26 |
| 2004 | 2.99 | 4.2 | 2.23 |
| 2003 | 3.16 | 3.85 | 2.38 |
| 2002 | 5.06 | 6.36 | 3.18 |
| 2001 | 6.07 | 7.48 | 4.54 |
| 2000 | 6.15 | 9.23 | 4.6 |