| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 0 | ||
| 2024 | 0 | ||
| 2023 | 1.14 | 1.74 | 0.33 |
| 2022 | 2.03 | 2.98 | 1.5 |
| 2021 | 2.43 | 3.64 | 1.45 |
| 2020 | 2.38 | 3.99 | 1.52 |
| 2019 | 4.56 | 9.08 | 2.92 |
| 2018 | 5.99 | 10.08 | 3.66 |
| 2017 | 10.9 | 17.6 | 9.16 |
| 2016 | 22.53 | 33.04 | 16.29 |
| 2015 | 27.09 | 38.46 | 7.43 |
| 2014 | 5.19 | 10.98 | 2.31 |
| 2013 | 2.52 | 3.3 | 1.95 |
| 2012 | 1.95 | 2.56 | 1.31 |
| 2011 | 3.38 | 4.25 | 2.2 |
| 2010 | 3.85 | 4.75 | 3.07 |
| 2009 | 2.3 | 3.79 | 0.92 |
| 2008 | 1.67 | 3.17 | 0.69 |
| 2007 | 3.18 | 5.52 | 1.69 |
| 2006 | 1.65 | 2.11 | 1.19 |
| 2005 | 1.32 | 1.64 | 0.9 |
| 2004 | 1.99 | 3.4 | 1.16 |