| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 2.33 | 3.08 | 0.78 |
| 2024 | 1.89 | 3.39 | 0.55 |
| 2023 | 0.63 | 1 | 0.51 |
| 2022 | 0.69 | 1.55 | 0.44 |
| 2021 | 0.77 | 1.07 | 0.67 |
| 2020 | 0.87 | 1.16 | 0.63 |
| 2019 | 1.1 | 1.45 | 0.88 |
| 2018 | 1.39 | 2.27 | 0.88 |
| 2017 | 2.6 | 3.5 | 1.91 |
| 2016 | 2.27 | 3.08 | 1.8 |
| 2015 | 2.73 | 5.46 | 1.74 |
| 2014 | 1.74 | 2.46 | 1.42 |
| 2013 | 1.83 | 2.19 | 1.52 |
| 2012 | 1.81 | 2.37 | 1.42 |
| 2011 | 2.76 | 3.6 | 2.04 |
| 2010 | 3.33 | 4.14 | 2.52 |
| 2009 | 3.65 | 4.92 | 2.21 |
| 2008 | 4.09 | 9.4 | 1.62 |
| 2007 | 7.85 | 15.43 | 2.77 |
| 2006 | 2.34 | 2.9 | 1.74 |
| 2005 | 2.27 | 3.06 | 1.67 |
| 2004 | 3.93 | 6.55 | 2.66 |
| 2003 | 7.75 | 11.22 | 5.5 |
| 2002 | 12.82 | 15.12 | 11.8 |
| 2001 | 17.89 | 22.3 | 12.97 |
| 2000 | 11.13 | 13.83 | 7.39 |
| 1999 | 8.02 | 9.48 | 6.56 |
| 1998 | 8.25 | 12.51 | 5.27 |