| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 0 | ||
| 2024 | 0 | ||
| 2023 | 0 | ||
| 2022 | 4.06 | 4.06 | 4.06 |
| 2021 | 2.14 | 4.17 | 0.98 |
| 2020 | 0.72 | 1.03 | 0.54 |
| 2019 | 0.84 | 1.03 | 0.69 |
| 2018 | 0.92 | 1.21 | 0.69 |
| 2017 | 1.25 | 1.68 | 0.94 |
| 2016 | 1.29 | 1.9 | 0.95 |
| 2015 | 1.44 | 2.39 | 1 |
| 2014 | 0.97 | 1.32 | 0.78 |
| 2013 | 1.4 | 2.05 | 0.97 |
| 2012 | 2.44 | 3.1 | 1.64 |
| 2011 | 3.68 | 4.53 | 2.41 |
| 2010 | 4.02 | 5.4 | 2.63 |
| 2009 | 4.43 | 6.2 | 2.35 |
| 2008 | 4.88 | 10.34 | 1.94 |
| 2007 | 32.08 | 76.74 | 7.09 |
| 2006 | 2.2 | 8.43 | 0.58 |
| 2005 | 0.77 | 2.73 | 0.55 |
| 2004 | 1.27 | 2.94 | 0.94 |
| 2003 | 1.49 | 3.02 | 1.25 |
| 2002 | 2.67 | 2.9 | 2.23 |
| 2001 | 3.49 | 4.52 | 2.35 |
| 2000 | 3.59 | 4.12 | 3.05 |
| 1999 | 4 | 5.43 | 2.88 |
| 1998 | 4 | 5.01 | 3.09 |