| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2023 | 6.46 | 7.53 | 4.76 |
| 2022 | 7.11 | 9.47 | 5.14 |
| 2021 | 13.12 | 17.95 | 8.97 |
| 2020 | 10.45 | 14.43 | 8.35 |
| 2019 | 9.41 | 12.45 | 6.44 |
| 2018 | 7.84 | 11.03 | 6.26 |
| 2017 | 7.87 | 11.26 | 6.47 |
| 2016 | 6.88 | 7.55 | 6.26 |
| 2015 | 8.92 | 12.14 | 6.35 |
| 2014 | 6.95 | 9.41 | 5.95 |
| 2013 | 7.24 | 9.68 | 5.43 |
| 2012 | 6.97 | 9.7 | 5.02 |
| 2011 | 9.35 | 12.5 | 7.79 |
| 2010 | 22.71 | 79.26 | 8.91 |
| 2009 | 69.74 | 111.08 | 7.18 |
| 2008 | 18.27 | 44.22 | 6.32 |
| 2007 | 38.07 | 51.62 | 28.2 |
| 2006 | 35.42 | 54.9 | 20.67 |
| 2005 | 44.42 | 58.69 | 24.29 |
| 2004 | 47.42 | 67.19 | 31.33 |
| 2003 | 51.09 | 62.02 | 42.67 |
| 2002 | 51.1 | 66.01 | 33.85 |
| 2001 | 82.54 | 185.45 | 42.35 |
| 2000 | 107.18 | 166.97 | 35.53 |
| 1999 | 42.21 | 57.84 | 24.81 |
| 1998 | 0 | -88.15 | |
| 1997 | 28.02 | 40.25 | 20.57 |