| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 0.58 | 0.64 | 0.49 |
| 2024 | 0.45 | 0.84 | 0.35 |
| 2023 | 0.47 | 0.55 | 0.4 |
| 2022 | 0.56 | 0.84 | 0.44 |
| 2021 | 0.59 | 0.86 | 0.33 |
| 2020 | 0.48 | 0.62 | 0.41 |
| 2019 | 0.61 | 0.86 | 0.5 |
| 2018 | 0.87 | 1.07 | 0.6 |
| 2017 | 1.59 | 2.42 | 0.97 |
| 2016 | 3.49 | 5.29 | 2.19 |
| 2015 | 3.66 | 6.75 | 2.43 |
| 2014 | 2.73 | 5.48 | 1.81 |
| 2013 | 3.44 | 4.82 | 2.5 |
| 2012 | 7.29 | 14.12 | 3.08 |
| 2011 | 17.19 | 44.4 | 9.82 |
| 2010 | 21.84 | 70.84 | 8.96 |
| 2009 | 71.24 | 248.36 | 5.67 |
| 2008 | 7.66 | 10.78 | 4.74 |
| 2007 | 8.42 | 13.07 | 2.76 |
| 2006 | 3.03 | 3.69 | 2.51 |
| 2005 | 2.09 | 2.81 | 1.08 |
| 2004 | 2.2 | 3.18 | 1.42 |