| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 2.86 | 4.51 | 2.46 |
| 2024 | 2.47 | 3.48 | 1.84 |
| 2023 | 3.15 | 3.75 | 2.65 |
| 2022 | 2.74 | 3.25 | 2.47 |
| 2021 | 2.69 | 3.59 | 2.21 |
| 2020 | 3.01 | 3.73 | 2.47 |
| 2019 | 2.9 | 3.69 | 2.38 |
| 2018 | 3.46 | 5.22 | 2.27 |
| 2017 | 8.92 | 10.71 | 5.05 |
| 2016 | 7.3 | 11.25 | 4.62 |
| 2015 | 6.54 | 10.15 | 3.31 |
| 2014 | 3.05 | 4.29 | 2.09 |
| 2013 | 2.08 | 2.55 | 1.81 |
| 2012 | 2.43 | 3.1 | 1.56 |
| 2011 | 3.73 | 4.64 | 2.62 |
| 2010 | 4.53 | 5.79 | 2.92 |
| 2009 | 8.38 | 16.97 | 4.76 |
| 2008 | 14.7 | 35.45 | 4.4 |
| 2007 | 124.98 | 336.64 | 23.51 |
| 2006 | 0 | -0.31 | |
| 2005 | 0 | -0.25 | |
| 2004 | 6.3 | 7.52 | 5.37 |
| 2003 | 5.08 | 5.47 | 4.42 |
| 2002 | 23.71 | 26.32 | 19.84 |
| 2001 | 7.77 | 9.72 | 5.67 |
| 2000 | 167.97 | 367.82 | 29.25 |
| 1999 | 10.07 | 11.43 | 8.69 |