| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 14.3 | 19.16 | 12.4 |
| 2024 | 15.45 | 23.66 | 10.87 |
| 2023 | 20.19 | 25.66 | 16.83 |
| 2022 | 23.13 | 29.49 | 18.47 |
| 2021 | 20.29 | 32.02 | 10.41 |
| 2020 | 9.4 | 15.16 | 2.61 |
| 2019 | 2.01 | 3.5 | 1.25 |
| 2018 | 1.03 | 1.78 | 0.91 |
| 2017 | 1.21 | 1.75 | 0.96 |
| 2016 | 1.28 | 1.98 | 0.76 |
| 2015 | 1.04 | 1.88 | 0.62 |
| 2014 | 0.69 | 0.9 | 0.57 |
| 2013 | 0.71 | 0.85 | 0.57 |
| 2012 | 0.91 | 1.3 | 0.67 |
| 2011 | 1.65 | 2.24 | 1.02 |
| 2010 | 2.32 | 3.01 | 1.85 |
| 2009 | 1.85 | 2.63 | 1.35 |
| 2008 | 3.07 | 6.17 | 0.88 |
| 2007 | 3.92 | 5.23 | 2.2 |
| 2006 | 1.76 | 2.29 | 1.24 |
| 2005 | 1.79 | 2.51 | 1.13 |
| 2004 | 1.93 | 2.9 | 1.35 |