| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 1.48 | 1.87 | 1.23 |
| 2024 | 1.58 | 2.26 | 1.2 |
| 2023 | 2.33 | 3.09 | 1.47 |
| 2022 | 1.98 | 3.1 | 1.49 |
| 2021 | 2.49 | 3.01 | 1.98 |
| 2020 | 3.46 | 4.64 | 2.36 |
| 2019 | 3.38 | 4.67 | 2.27 |
| 2018 | 2.93 | 5.05 | 1.99 |
| 2017 | 4.59 | 5.8 | 3.51 |
| 2016 | 5.24 | 7.02 | 4.32 |
| 2015 | 6.09 | 13.2 | 2.2 |
| 2014 | 5.11 | 12.6 | 2.07 |
| 2013 | 6.97 | 11.74 | 4.32 |
| 2012 | 4.86 | 5.74 | 3.48 |
| 2011 | 6.96 | 13.88 | 3.33 |
| 2010 | 24.06 | 35.73 | 10.92 |
| 2009 | 17.16 | 28.97 | 8.17 |
| 2008 | 11.22 | 21.56 | 4.68 |
| 2007 | 12.19 | 22.44 | 3.17 |
| 2006 | 3.85 | 4.76 | 2.98 |
| 2005 | 1.53 | 3.42 | 0.36 |
| 2004 | 1.5 | 2.65 | 1 |