| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 1.54 | 1.81 | 1.39 |
| 2024 | 1.73 | 2.18 | 1.42 |
| 2023 | 5.89 | 14.62 | 2.02 |
| 2022 | 3.7 | 15.72 | 1.57 |
| 2021 | 1.25 | 2.04 | 0.81 |
| 2020 | 1.04 | 1.35 | 0.79 |
| 2019 | 0.98 | 1.24 | 0.82 |
| 2018 | 1.08 | 1.42 | 0.77 |
| 2017 | 1.54 | 1.9 | 1.24 |
| 2016 | 1.46 | 1.77 | 1.17 |
| 2015 | 1.78 | 3.21 | 1.23 |
| 2014 | 1.07 | 1.51 | 0.86 |
| 2013 | 0.99 | 1.16 | 0.82 |
| 2012 | 1.22 | 1.47 | 0.95 |
| 2011 | 2.62 | 3.96 | 1.22 |
| 2010 | 2.79 | 3.83 | 1.97 |
| 2009 | 2.31 | 2.86 | 1.79 |
| 2008 | 3.96 | 8.32 | 1.34 |
| 2007 | 6.67 | 8.42 | 5.25 |
| 2006 | 5.13 | 8.37 | 2.88 |
| 2005 | 2.96 | 3.67 | 2.49 |
| 2004 | 3.15 | 5.15 | 1.36 |
| 2003 | 3.95 | 4.57 | 2.75 |
| 2002 | 8.46 | 25.83 | 4.21 |