| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2023 | 20.4 | 25.59 | 17.3 |
| 2022 | 17.17 | 22.11 | 14.19 |
| 2021 | 29.86 | 45.39 | 19.5 |
| 2020 | 37.99 | 57.68 | 26.9 |
| 2019 | 43.9 | 64.39 | 29.17 |
| 2018 | 28.34 | 29.42 | 26.63 |
| 2017 | 18.82 | 21.64 | 17.69 |
| 2016 | 18.48 | 21.18 | 16.68 |
| 2015 | 27.23 | 41.05 | 19.71 |
| 2014 | 24.57 | 35.04 | 19.17 |
| 2013 | 0 | -12.79 | |
| 2012 | 22.2 | 29.44 | 17.17 |
| 2011 | 23.93 | 36.86 | 17.4 |
| 2010 | 31.48 | 44.15 | 21.28 |
| 2009 | 32.45 | 40.35 | 23.86 |
| 2008 | 42.87 | 79.57 | 15.27 |
| 2007 | 57.17 | 71.93 | 45.91 |
| 2006 | 30.13 | 52.6 | 19.53 |
| 2005 | 19.58 | 24.32 | 15.75 |
| 2004 | 21.44 | 28 | 16.1 |
| 2003 | 19.18 | 23.2 | 15.46 |
| 2002 | 21.98 | 26.03 | 16.99 |
| 2001 | 37.65 | 52.31 | 24.74 |
| 2000 | 59.57 | 76.64 | 45.84 |
| 1999 | 34.61 | 56.96 | 25.77 |
| 1998 | 55.16 | 80.19 | 35.64 |