| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 1.51 | 1.59 | 1.39 |
| 2024 | 1.61 | 1.86 | 1.37 |
| 2023 | 3.31 | 6.05 | 1.66 |
| 2022 | 3.13 | 3.89 | 2.44 |
| 2021 | 3.15 | 4.25 | 2.61 |
| 2020 | 3.44 | 4.98 | 2.86 |
| 2019 | 3.48 | 4.31 | 2.96 |
| 2018 | 3.5 | 4.11 | 2.77 |
| 2017 | 4.99 | 6.21 | 3.88 |
| 2016 | 6.07 | 7.92 | 5.47 |
| 2015 | 10.02 | 16.19 | 6.15 |
| 2014 | 8.37 | 10.58 | 6.65 |
| 2013 | 7.15 | 9.53 | 5.41 |
| 2012 | 6.31 | 7.47 | 4.27 |
| 2011 | 22.27 | 44.36 | 5.54 |
| 2010 | 19.73 | 23.7 | 14.38 |
| 2009 | 27.92 | 131.2 | 8.22 |
| 2008 | 6.18 | 9.4 | 2.55 |
| 2007 | 2.95 | 5.51 | 1.11 |
| 2006 | 1.14 | 1.66 | 0.77 |
| 2005 | 0.89 | 1.18 | 0.71 |
| 2004 | 2.12 | 3.63 | 1.24 |
| 2003 | 3.58 | 4.48 | 2.51 |
| 2002 | 3.92 | 4.92 | 2.94 |