| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2026 | 0 | ||
| 2025 | 0 | ||
| 2024 | 0 | ||
| 2023 | 0 | ||
| 2022 | 4.26 | 7.02 | 1.01 |
| 2021 | 4.98 | 7.38 | 3.24 |
| 2020 | 3.71 | 5.09 | 2.07 |
| 2019 | 2.57 | 4.46 | 1.82 |
| 2018 | 4.15 | 8.98 | 1.79 |
| 2017 | 8.64 | 11.73 | 6.69 |
| 2016 | 6.92 | 8.39 | 5.17 |
| 2015 | 6.27 | 10.05 | 3.9 |
| 2014 | 6.23 | 7.73 | 5.27 |
| 2013 | 6.82 | 8.56 | 5.5 |
| 2012 | 3.67 | 6.69 | 2.36 |
| 2011 | 4.22 | 5.33 | 2.55 |
| 2010 | 6.05 | 11.31 | 4.03 |
| 2009 | 3.29 | 4.7 | 1.68 |
| 2008 | 2.51 | 4.35 | 1.09 |
| 2007 | 3.51 | 7.2 | 1.33 |
| 2006 | 1.34 | 1.72 | 1.1 |
| 2005 | 1.41 | 2.19 | 0.93 |
| 2004 | 2.65 | 3.82 | 2.03 |
| 2003 | 2.95 | 4.18 | 1.89 |
| 2002 | 4.82 | 5.8 | 3.86 |
| 2001 | 8.47 | 11.2 | 5.64 |
| 2000 | 8.55 | 11.43 | 5.36 |