| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2026 | 7.52 | 11.9 | 6.67 |
| 2025 | 5.95 | 8.6 | 2.72 |
| 2024 | 1.43 | 4.77 | 0.48 |
| 2023 | 0.61 | 0.95 | 0.37 |
| 2022 | 0.47 | 0.69 | 0.37 |
| 2021 | 0.51 | 0.62 | 0.42 |
| 2020 | 0.64 | 0.76 | 0.58 |
| 2019 | 0.8 | 1.04 | 0.66 |
| 2018 | 0.94 | 1.47 | 0.64 |
| 2017 | 1.52 | 1.98 | 1.18 |
| 2016 | 2.21 | 2.85 | 1.65 |
| 2015 | 3.1 | 4.93 | 2 |
| 2014 | 1.71 | 2.4 | 1.35 |
| 2013 | 1.81 | 2.39 | 1.48 |
| 2012 | 2.04 | 2.36 | 1.75 |
| 2011 | 2.75 | 3.7 | 1.76 |
| 2010 | 3.73 | 5 | 2.86 |
| 2009 | 5.31 | 7.19 | 2.6 |
| 2008 | 774.45 | 2512.86 | 1.88 |
| 2007 | 569.74 | 1944.27 | 38.68 |
| 2006 | 26.25 | 39.41 | 14.07 |
| 2005 | 14.21 | 18.21 | 10.92 |
| 2004 | 59.68 | 229.26 | 14.81 |
| 2003 | 77.06 | 208.33 | 12.49 |
| 2002 | 13.86 | 20.64 | 7.02 |
| 2001 | 20.8 | 24.27 | 16.56 |
| 2000 | 6.87 | 8.57 | 5.05 |
| 1999 | 4.67 | 6.01 | 3.8 |
| 1998 | 9.45 | 14.5 | 5.54 |
| 1997 | 6.42 | 9.37 | 4.22 |