| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 1.45 | 1.81 | 1.11 |
| 2024 | 1.06 | 2.02 | 0.52 |
| 2023 | 0.84 | 1.23 | 0.69 |
| 2022 | 1.03 | 2.04 | 0.63 |
| 2021 | 2.61 | 3.87 | 1.41 |
| 2020 | 3.67 | 5.58 | 2.62 |
| 2019 | 5.46 | 6.67 | 4.59 |
| 2018 | 5.05 | 6.37 | 4.01 |
| 2017 | 6.54 | 8.84 | 4.81 |
| 2016 | 6.15 | 7.89 | 4.83 |
| 2015 | 9.16 | 14.71 | 5.69 |
| 2014 | 7.24 | 9.62 | 5.91 |
| 2013 | 5.61 | 7.7 | 3.48 |
| 2012 | 4.5 | 5.84 | 3.62 |
| 2011 | 10.01 | 14.25 | 4.47 |
| 2010 | 13.87 | 21.42 | 9.32 |
| 2009 | 19.18 | 28.12 | 11.37 |
| 2008 | 16.77 | 24.35 | 8.97 |
| 2007 | 15.67 | 22.84 | 6.27 |
| 2006 | 6.95 | 11.18 | 3.5 |
| 2005 | 3.53 | 4.91 | 2.64 |
| 2004 | 5.64 | 8.74 | 3.82 |