| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2024 | 1.43 | 2.36 | 1.12 |
| 2023 | 2.76 | 4.18 | 1.94 |
| 2022 | 4.36 | 6.75 | 2.84 |
| 2021 | 5.53 | 8.17 | 3.79 |
| 2020 | 2.18 | 4.96 | 1.04 |
| 2019 | 1.1 | 1.77 | 0.91 |
| 2018 | 1.18 | 1.4 | 0.55 |
| 2017 | 1.8 | 2.38 | 1.33 |
| 2016 | 2.09 | 2.95 | 1.76 |
| 2015 | 2.78 | 4.34 | 1.65 |
| 2014 | 1.27 | 2.67 | 0.5 |
| 2013 | 0.58 | 0.76 | 0.44 |
| 2012 | 0.48 | 0.64 | 0.34 |
| 2011 | 0.67 | 0.88 | 0.36 |
| 2010 | 0.8 | 1.12 | 0.56 |
| 2009 | 0.79 | 1.24 | 0.35 |
| 2008 | 0.68 | 1.51 | 0.24 |
| 2007 | 1.13 | 1.9 | 0.42 |
| 2006 | 0.38 | 0.46 | 0.26 |
| 2005 | 0.58 | 1.12 | 0.33 |
| 2004 | 0.7 | 1.19 | 0.43 |