| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 6.17 | 6.47 | 5.61 |
| 2024 | 5.9 | 7.51 | 4.8 |
| 2023 | 7.92 | 9.79 | 6.5 |
| 2022 | 16.22 | 44.07 | 5.35 |
| 2021 | 31.59 | 44.51 | 21.4 |
| 2020 | 17.78 | 29.14 | 13.57 |
| 2019 | 19.2 | 21.87 | 17.04 |
| 2018 | 447.01 | 447.01 | 447.01 |
| 2017 | 0 | -14.14 | |
| 2016 | 135.59 | 170.86 | 110.61 |
| 2015 | 67.15 | 208.3 | 23.06 |
| 2014 | 20.18 | 34.78 | 8.27 |
| 2013 | 8.24 | 11.53 | 6.65 |
| 2012 | 5.68 | 7.46 | 4 |
| 2011 | 7.91 | 10.53 | 4.95 |
| 2010 | 7.66 | 10.26 | 5.25 |
| 2009 | 4.03 | 6.54 | 2.16 |
| 2008 | 3.47 | 7.23 | 1.52 |
| 2007 | 5.39 | 10.63 | 1.37 |
| 2006 | 1.26 | 1.76 | 0.92 |
| 2005 | 1.03 | 1.28 | 0.81 |
| 2004 | 1.71 | 2.17 | 1.25 |
| 2003 | 2.13 | 2.54 | 1.71 |
| 2002 | 2.12 | 2.59 | 1.56 |
| 2001 | 2.28 | 2.69 | 1.85 |
| 2000 | 2.26 | 2.7 | 1.64 |
| 1999 | 1.93 | 2.49 | 1.33 |
| 1998 | 2.62 | 3.42 | 1.83 |
| 1997 | 5.21 | 8.16 | 4.03 |