| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 3.51 | 4.3 | 2.98 |
| 2024 | 4.27 | 5.33 | 3.27 |
| 2023 | 4.8 | 5.52 | 4.27 |
| 2022 | 4.27 | 5.73 | 3.21 |
| 2021 | 9.02 | 13.71 | 4.89 |
| 2020 | 11.03 | 15.74 | 7.47 |
| 2019 | 6.92 | 8.65 | 4.68 |
| 2018 | 5.76 | 6.94 | 4.7 |
| 2017 | 9.18 | 11.47 | 6.58 |
| 2016 | 8.7 | 11.41 | 6.97 |
| 2015 | 8.68 | 14.2 | 5.4 |
| 2014 | 5.51 | 7.28 | 4.27 |
| 2013 | 5.34 | 6.86 | 4.22 |
| 2012 | 5.41 | 6.57 | 4.02 |
| 2011 | 8.65 | 11.47 | 6.35 |
| 2010 | 13.79 | 18.01 | 10.53 |
| 2009 | 15.46 | 22.81 | 11.34 |
| 2008 | 12.58 | 26.27 | 6.65 |
| 2007 | 18.52 | 26.63 | 10.08 |
| 2006 | 6.04 | 11.08 | 2.88 |
| 2005 | 3.11 | 4.06 | 2.04 |
| 2004 | 4.82 | 10.32 | 2.69 |
| 2003 | 7.7 | 10.65 | 2.81 |
| 2002 | 10.76 | 12.95 | 9.47 |
| 2001 | 15.84 | 22.54 | 11.32 |
| 2000 | 13.63 | 15.85 | 11.88 |
| 1999 | 10.4 | 15.15 | 7.59 |