| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 1.58 | 2.16 | 1.24 |
| 2024 | 1.9 | 2.5 | 0.96 |
| 2023 | 2.23 | 4.95 | 0.9 |
| 2022 | 3.92 | 5.46 | 2.4 |
| 2021 | 4.79 | 6.76 | 2.99 |
| 2020 | 6.94 | 10.21 | 4.4 |
| 2019 | 8.23 | 11.08 | 5.95 |
| 2018 | 7.23 | 10.78 | 5.4 |
| 2017 | 12.36 | 17.24 | 10.06 |
| 2016 | 14.91 | 17.57 | 12.79 |
| 2015 | 12.73 | 24.47 | 5.99 |
| 2014 | 5.28 | 7.9 | 2.53 |
| 2013 | 2.37 | 2.42 | 2.3 |
| 2012 | 1.88 | 2.67 | 1.22 |
| 2011 | 3.35 | 4.81 | 1.42 |
| 2010 | 4.78 | 6.32 | 3.64 |
| 2009 | 3.06 | 5.18 | 1.34 |
| 2008 | 2.94 | 6.49 | 0.98 |
| 2007 | 7.02 | 12.11 | 2.71 |
| 2006 | 2.45 | 3.63 | 1.7 |
| 2005 | 1.08 | 2.44 | 0.45 |
| 2004 | 1.94 | 3.88 | 0.94 |