| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 8.66 | 11.59 | 5.49 |
| 2024 | 3.75 | 8.92 | 1.32 |
| 2023 | 6.51 | 8.83 | 5.06 |
| 2022 | 5.39 | 7.94 | 3.89 |
| 2021 | 4.25 | 8.19 | 1.97 |
| 2020 | 2.46 | 3.2 | 1.95 |
| 2019 | 2.92 | 3.96 | 2.28 |
| 2018 | 3.55 | 5.42 | 2.37 |
| 2017 | 5.76 | 6.87 | 5.08 |
| 2016 | 5.1 | 6.91 | 4.44 |
| 2015 | 5.7 | 12.29 | 3.55 |
| 2014 | 2.93 | 4.42 | 2 |
| 2013 | 3.41 | 4.92 | 2.44 |
| 2012 | 5.7 | 7.68 | 3.99 |
| 2011 | 9.55 | 15.29 | 4.75 |
| 2010 | 7.66 | 10.91 | 5.37 |
| 2009 | 11.87 | 16.47 | 9.53 |
| 2008 | 0 | ||
| 2007 | 0 | -5.58 | |
| 2006 | 9.53 | 35.98 | 1.05 |
| 2005 | 1.45 | 2.18 | 1.02 |
| 2004 | 3.83 | 6.77 | 1.85 |
| 2003 | 7.15 | 8.61 | 5.57 |
| 2002 | 9.83 | 11.19 | 8.26 |
| 2001 | 11.67 | 13.88 | 9 |
| 2000 | 9.12 | 14.21 | 6.11 |
| 1999 | 4.96 | 6.45 | 3.86 |
| 1998 | 5.95 | 8.5 | 4.27 |
| 1997 | 5.93 | 7.42 | 4.38 |