| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2024 | 3.14 | 8.01 | 1.08 |
| 2023 | 1.61 | 1.78 | 1.46 |
| 2022 | 1.57 | 1.89 | 1.3 |
| 2021 | 1.83 | 2.16 | 1.61 |
| 2020 | 1.92 | 2.7 | 1.31 |
| 2019 | 1.68 | 2.9 | 1.25 |
| 2018 | 1.55 | 2 | 1.22 |
| 2017 | 2.5 | 3.15 | 1.91 |
| 2016 | 3.22 | 4.01 | 2.66 |
| 2015 | 5.44 | 9.93 | 2.94 |
| 2014 | 2.3 | 3.71 | 1.56 |
| 2013 | 2.04 | 2.56 | 1.71 |
| 2012 | 2.94 | 4.94 | 2.2 |
| 2011 | 3.94 | 5.51 | 2.89 |
| 2010 | 6.45 | 8.17 | 5.18 |
| 2009 | 4.47 | 7.24 | 2.44 |
| 2008 | 4.42 | 11.87 | 1.64 |
| 2007 | 12.21 | 22.86 | 4.98 |
| 2006 | 3.4 | 5.21 | 2.27 |
| 2005 | 3.6 | 5.05 | 2.82 |
| 2004 | 7.79 | 27.3 | 4.36 |
| 2003 | 24.46 | 41.71 | 14.75 |
| 2002 | 40.04 | 43.47 | 35.7 |
| 2001 | 84.96 | 112.24 | 52.15 |
| 2000 | 26.44 | 40.03 | 16.87 |
| 1999 | 6.38 | 9.1 | 4.89 |
| 1998 | 6.22 | 7.23 | 4.22 |