| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 3.12 | 3.54 | 2.68 |
| 2024 | 2.5 | 3.53 | 1.89 |
| 2023 | 2.99 | 3.25 | 2.61 |
| 2022 | 3.52 | 4.39 | 2.96 |
| 2021 | 4.13 | 5.9 | 2.41 |
| 2020 | 2.74 | 3.56 | 2.15 |
| 2019 | 3.81 | 5.42 | 3.1 |
| 2018 | 4.11 | 5.81 | 3.08 |
| 2017 | 7.76 | 10.63 | 4.98 |
| 2016 | 6.06 | 10.37 | 4.35 |
| 2015 | 6.41 | 8.37 | 3.82 |
| 2014 | 3.64 | 5.03 | 2.49 |
| 2013 | 3.22 | 4.8 | 2.38 |
| 2012 | 3.19 | 3.65 | 2.72 |
| 2011 | 0 | -1.67 | |
| 2010 | 0 | -1.05 | |
| 2009 | 0 | -0.85 | |
| 2008 | 0 | -2.01 | |
| 2007 | 4.28 | 6.84 | 2.16 |
| 2006 | 2.03 | 3.09 | 0.98 |
| 2005 | 1.25 | 1.85 | 0.85 |
| 2004 | 2.48 | 3.36 | 1.71 |
| 2003 | 2.65 | 3.36 | 2.26 |
| 2002 | 3.45 | 4.18 | 2.38 |
| 2001 | 4.57 | 5.71 | 3.02 |
| 2000 | 9.09 | 12.51 | 6.7 |
| 1999 | 6.9 | 10.72 | 2.59 |
| 1998 | 3.08 | 3.79 | 2.31 |
| 1997 | 4.33 | 6.75 | 3.01 |