| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2024 | 8.64 | 11.65 | 5.83 |
| 2023 | 12.8 | 18.84 | 8.64 |
| 2022 | 19.4 | 26 | 14.03 |
| 2021 | 31.49 | 44.58 | 23.62 |
| 2020 | 16.5 | 39.49 | 9.58 |
| 2019 | 8.48 | 11.86 | 4.78 |
| 2018 | 8.01 | 11.11 | 4.55 |
| 2017 | 6.95 | 10.33 | 4.61 |
| 2016 | 3.88 | 4.7 | 3.01 |
| 2015 | 4.28 | 5.93 | 2.89 |
| 2014 | 3.59 | 5.22 | 2.61 |
| 2013 | 5.92 | 10.62 | 3.57 |
| 2012 | 10.76 | 12.75 | 8.16 |
| 2011 | 13.25 | 16.56 | 10.56 |
| 2010 | 12.27 | 18.14 | 9.2 |
| 2009 | 7.22 | 11.59 | 3.44 |
| 2008 | 5.95 | 14.09 | 2.84 |
| 2007 | 13.46 | 18.31 | 10.48 |
| 2006 | 6.57 | 12.65 | 3.62 |
| 2005 | 3.28 | 4.12 | 2.61 |
| 2004 | 3.31 | 4.27 | 2.69 |
| 2003 | 3.52 | 3.86 | 3.26 |
| 2002 | 4.45 | 5.05 | 3.01 |
| 2001 | 5.44 | 6.76 | 3.99 |
| 2000 | 4.45 | 5.68 | 3.42 |
| 1999 | 3.65 | 5.03 | 2.82 |
| 1998 | 3.45 | 4.21 | 2.88 |
| 1997 | 3.95 | 5.94 | 2.92 |