| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 3.94 | 4.65 | 3.19 |
| 2024 | 5.21 | 7.33 | 3.52 |
| 2023 | 9.35 | 12.05 | 6.45 |
| 2022 | 10.68 | 13.93 | 7.23 |
| 2021 | 14.36 | 21.01 | 9.37 |
| 2020 | 9.17 | 16.32 | 5.25 |
| 2019 | 5.97 | 7.79 | 3.45 |
| 2018 | 5.08 | 7.34 | 3.31 |
| 2017 | 6.01 | 7.86 | 4.33 |
| 2016 | 3.76 | 4.79 | 2.76 |
| 2015 | 3.3 | 4.64 | 2.54 |
| 2014 | 2.41 | 2.97 | 1.98 |
| 2013 | 3.71 | 6.28 | 2.71 |
| 2012 | 7.38 | 10.16 | 5.21 |
| 2011 | 10.48 | 13.47 | 8.23 |
| 2010 | 10.94 | 14.35 | 7.77 |
| 2009 | 10.38 | 14.5 | 7.34 |
| 2008 | 15.61 | 28.07 | 7.14 |
| 2007 | 18.44 | 28.74 | 10.79 |
| 2006 | 5.96 | 12.73 | 2.25 |
| 2005 | 2.21 | 2.97 | 1.78 |
| 2004 | 2.34 | 3.11 | 1.95 |
| 2003 | 2.65 | 3.9 | 2.19 |
| 2002 | 3.3 | 3.85 | 2.58 |
| 2001 | 4.09 | 5.05 | 3.05 |
| 2000 | 4.47 | 5.14 | 3.91 |
| 1999 | 3.74 | 5.47 | 2.96 |
| 1998 | 8.06 | 12.81 | 4.58 |
| 1997 | 10.39 | 18.87 | 4.67 |