| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 2.94 | 3.41 | 2.61 |
| 2024 | 4.42 | 7.16 | 2.84 |
| 2023 | 7.51 | 11.39 | 5.52 |
| 2022 | 4.62 | 6.98 | 2.78 |
| 2021 | 2.69 | 3.77 | 2.12 |
| 2020 | 2.47 | 3.19 | 1.84 |
| 2019 | 1.83 | 2.3 | 1.37 |
| 2018 | 3.67 | 8.01 | 1.44 |
| 2017 | 4.96 | 6.07 | 4.24 |
| 2016 | 5.13 | 7.54 | 4.09 |
| 2015 | 8.09 | 17.76 | 4.45 |
| 2014 | 4.37 | 5.98 | 3.41 |
| 2013 | 3.65 | 4.87 | 2.47 |
| 2012 | 2.61 | 3.1 | 2.05 |
| 2011 | 2.83 | 3.9 | 2.05 |
| 2010 | 3.38 | 4.39 | 2.25 |
| 2009 | 2.49 | 3.96 | 1.49 |
| 2008 | 2.17 | 4.02 | 1 |
| 2007 | 3.22 | 4.73 | 1.21 |
| 2006 | 1.14 | 1.35 | 0.97 |
| 2005 | 1.3 | 1.68 | 0.95 |
| 2004 | 3.75 | 8.31 | 1.66 |
| 2003 | 7.53 | 9.57 | 5.12 |
| 2002 | 8.39 | 10.86 | 7.15 |
| 2001 | 7.82 | 9.78 | 5.68 |
| 2000 | 5.59 | 8.2 | 4.27 |
| 1999 | 5.13 | 7.26 | 4.08 |
| 1998 | 4.92 | 5.64 | 4.08 |