| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2023 | 30.64 | 32.72 | 28.43 |
| 2022 | 31.33 | 36.5 | 24.03 |
| 2021 | 32.14 | 39.89 | 22.54 |
| 2020 | 37.69 | 59.16 | 24.56 |
| 2019 | 27.54 | 33.31 | 21 |
| 2018 | 29.15 | 39.37 | 18.98 |
| 2017 | 31.89 | 38.59 | 26.8 |
| 2016 | 39.41 | 56.04 | 29.38 |
| 2015 | 55.08 | 85.8 | 39.79 |
| 2014 | 39.12 | 49.37 | 28.69 |
| 2013 | 26.65 | 32.39 | 20.8 |
| 2012 | 26.52 | 34.34 | 16.41 |
| 2011 | 35.19 | 52.73 | 26.59 |
| 2010 | 45.86 | 56.15 | 39.86 |
| 2009 | 43.26 | 59.01 | 35.26 |
| 2008 | 42.6 | 78.63 | 24.55 |
| 2007 | 62.61 | 96.38 | 36.97 |
| 2006 | 29 | 41.18 | 22.56 |
| 2005 | 20.75 | 24.02 | 17.48 |
| 2004 | 29.51 | 40.86 | 22.59 |
| 2003 | 43.95 | 61.41 | 29.65 |
| 2002 | 56.56 | 66.7 | 43.34 |
| 2001 | 69.38 | 92.7 | 43.18 |