| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 2.34 | 6.31 | 1.5 |
| 2024 | 1.1 | 2.34 | 0.58 |
| 2023 | 1.4 | 2.11 | 0.85 |
| 2022 | 2.23 | 3.19 | 1.69 |
| 2021 | 2.33 | 3.24 | 1.6 |
| 2020 | 1.28 | 2.07 | 0.87 |
| 2019 | 1.07 | 1.43 | 0.75 |
| 2018 | 1.05 | 1.81 | 0.7 |
| 2017 | 2.24 | 2.91 | 1.7 |
| 2016 | 3.21 | 4.12 | 2.76 |
| 2015 | 4.53 | 8.17 | 2.87 |
| 2014 | 3.22 | 4.36 | 2.1 |
| 2013 | 5.47 | 7.27 | 3.97 |
| 2012 | 3.44 | 5.9 | 2.16 |
| 2011 | 4.24 | 6.48 | 2.15 |
| 2010 | 6.63 | 10.95 | 3.84 |
| 2009 | 7.75 | 11.67 | 2.46 |
| 2008 | 4.26 | 8.03 | 1.83 |
| 2007 | 4.57 | 6.3 | 2.64 |
| 2006 | 2.93 | 5.01 | 1.64 |
| 2005 | 1.21 | 2.19 | 0.58 |
| 2004 | 1.04 | 1.97 | 0.67 |