| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 9.08 | 10.4 | 7.37 |
| 2024 | 3.08 | 12.71 | 1.16 |
| 2023 | 1.76 | 2.72 | 1.38 |
| 2022 | 1.49 | 1.77 | 1.16 |
| 2021 | 1.41 | 1.88 | 1.04 |
| 2020 | 1.65 | 2.48 | 1.01 |
| 2019 | 1.24 | 1.59 | 1.01 |
| 2018 | 1.63 | 2.58 | 1.11 |
| 2017 | 2.23 | 3.06 | 1.69 |
| 2016 | 2.62 | 3.15 | 2.21 |
| 2015 | 4.19 | 8.93 | 2.45 |
| 2014 | 2.14 | 3.01 | 1.59 |
| 2013 | 1.79 | 2.23 | 1.44 |
| 2012 | 1.82 | 2.6 | 1.37 |
| 2011 | 3.14 | 4.65 | 1.75 |
| 2010 | 2.9 | 3.61 | 2.2 |
| 2009 | 2.42 | 3.52 | 1.25 |
| 2008 | 2.3 | 5.39 | 0.92 |
| 2007 | 2.8 | 4.67 | 1.09 |
| 2006 | 1.19 | 1.53 | 0.93 |
| 2005 | 1.09 | 1.64 | 0.67 |
| 2004 | 2.35 | 3.6 | 1.54 |
| 2003 | 2.89 | 3.43 | 2.5 |
| 2002 | 3.47 | 3.99 | 2.52 |
| 2001 | 4.27 | 5.29 | 3.14 |
| 2000 | 3.64 | 4.55 | 2.39 |
| 1999 | 13.44 | 17.19 | 11.62 |
| 1998 | 18.49 | 22.95 | 14.68 |
| 1997 | 3.27 | 4.42 | 1.89 |