| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 2.03 | 2.24 | 1.78 |
| 2024 | 2.56 | 3.28 | 1.64 |
| 2023 | 3 | 4.28 | 2.18 |
| 2022 | 4.47 | 6.25 | 2.72 |
| 2021 | 3.77 | 8.27 | 1.64 |
| 2020 | 1.47 | 1.82 | 1.22 |
| 2019 | 1.61 | 2.2 | 1.28 |
| 2018 | 2.07 | 2.79 | 1.4 |
| 2017 | 3.45 | 5.02 | 2.49 |
| 2016 | 4.31 | 4.9 | 3.31 |
| 2015 | 6.59 | 12.71 | 2.96 |
| 2014 | 5.38 | 9.44 | 3.92 |
| 2013 | 5.3 | 6.31 | 4.45 |
| 2012 | 6.76 | 9.03 | 4.87 |
| 2011 | 12.84 | 18.64 | 5.76 |
| 2010 | 10.22 | 17.86 | 5.65 |
| 2009 | 61.21 | 82.82 | 51.99 |
| 2008 | 73.69 | 179.52 | 26.76 |
| 2007 | 21.26 | 35.81 | 6.83 |
| 2006 | 5.44 | 8.6 | 2.11 |
| 2005 | 2 | 3.08 | 1.14 |
| 2004 | 2.93 | 4.85 | 1.49 |
| 2003 | 5.44 | 6.44 | 4.13 |
| 2002 | 5.43 | 6.21 | 3.42 |
| 2001 | 5.98 | 7.39 | 4.4 |
| 2000 | 6.11 | 7.53 | 4.03 |
| 1999 | 4.46 | 5.57 | 3.37 |
| 1998 | 5.48 | 7.21 | 4.25 |
| 1997 | 4.99 | 6.69 | 4.06 |