| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2024 | 2.33 | 2.64 | 1.97 |
| 2023 | 4.09 | 6.64 | 2.44 |
| 2022 | 3.54 | 4.33 | 2.78 |
| 2021 | 3.58 | 4.93 | 3.02 |
| 2020 | 3.36 | 4.74 | 2.7 |
| 2019 | 3.32 | 4.17 | 2.79 |
| 2018 | 3.39 | 4.15 | 2.74 |
| 2017 | 4.33 | 5.45 | 3.37 |
| 2016 | 5.16 | 6.46 | 4.67 |
| 2015 | 8.25 | 12.99 | 5.01 |
| 2014 | 6.82 | 9.38 | 5.42 |
| 2013 | 7.24 | 8.86 | 5.31 |
| 2012 | 5.99 | 8.38 | 4.26 |
| 2011 | 22.43 | 42.7 | 6.46 |
| 2010 | 20.66 | 24.12 | 16.14 |
| 2009 | 113.12 | 197.39 | 1.88 |
| 2008 | 19.84 | 116.68 | 0.53 |
| 2007 | 0.69 | 1.27 | 0.3 |
| 2006 | 0.4 | 0.6 | 0.3 |
| 2005 | 0.33 | 0.46 | 0.18 |
| 2004 | 0.42 | 0.81 | 0.26 |