| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2023 | 27.47 | 32.56 | 17.55 |
| 2022 | 31.8 | 37.64 | 25.22 |
| 2021 | 44.41 | 70.34 | 32.05 |
| 2020 | 25.4 | 52.99 | 14.03 |
| 2019 | 14.53 | 18.78 | 12.63 |
| 2018 | 18.81 | 24.18 | 12.16 |
| 2017 | 18.99 | 23.6 | 15.41 |
| 2016 | 14.6 | 16.72 | 12.61 |
| 2015 | 14.76 | 19.3 | 11.24 |
| 2014 | 9.27 | 12.28 | 7.9 |
| 2013 | 10.29 | 11.88 | 8.75 |
| 2012 | 10.42 | 12.25 | 9.23 |
| 2011 | 11.47 | 14.51 | 9.23 |
| 2010 | 30.09 | 116.25 | 11.05 |
| 2009 | 209.53 | 904.6 | 9.79 |
| 2008 | 21.07 | 47.22 | 8.28 |
| 2007 | 38.46 | 51.01 | 25.79 |
| 2006 | 17.56 | 28.19 | 13.13 |
| 2005 | 16.3 | 22.67 | 11.34 |
| 2004 | 23.23 | 34.52 | 11.89 |
| 2003 | 24.75 | 31.42 | 19.67 |
| 2002 | 30.09 | 37.88 | 23.41 |
| 2001 | 35.62 | 42.02 | 31.13 |
| 2000 | 53.16 | 72.19 | 32.41 |
| 1999 | 108.52 | 123.67 | 97.01 |
| 1998 | 131.55 | 150.9 | 115.42 |
| 1997 | 3060.2 | 7457.67 | 770.09 |