| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 2.18 | 2.39 | 1.9 |
| 2024 | 2.32 | 3.43 | 1.64 |
| 2023 | 3.17 | 3.52 | 2.35 |
| 2022 | 2.64 | 3.24 | 1.73 |
| 2021 | 1.71 | 2.88 | 1.16 |
| 2020 | 1.58 | 2.47 | 1.12 |
| 2019 | 1.33 | 1.74 | 1.09 |
| 2018 | 6.72 | 46.16 | 1.12 |
| 2017 | 17.94 | 27.26 | 12.31 |
| 2016 | 23.04 | 37.03 | 17.59 |
| 2015 | 17.03 | 27.05 | 8.59 |
| 2014 | 8.25 | 11.87 | 6 |
| 2013 | 6.66 | 8.04 | 5.27 |
| 2012 | 4.84 | 6.55 | 3.61 |
| 2011 | 5.78 | 7.83 | 3.75 |
| 2010 | 8.71 | 13.78 | 6.15 |
| 2009 | 6.66 | 9.11 | 4.06 |
| 2008 | 8 | 19.42 | 2.78 |
| 2007 | 14.99 | 27.49 | 5.97 |
| 2006 | 6.03 | 7.29 | 4.26 |
| 2005 | 6.14 | 9.56 | 4.31 |
| 2004 | 10.3 | 15.09 | 6.79 |
| 2003 | 14.64 | 52.41 | 8.94 |
| 2002 | 28.38 | 41.35 | 4.12 |
| 2001 | 10.52 | 13.6 | 7.1 |
| 2000 | 12.17 | 16.54 | 6.54 |
| 1999 | 3.88 | 5.41 | 2.29 |
| 1998 | 3.82 | 5.56 | 2.4 |
| 1997 | 3.11 | 4.87 | 2.13 |