| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 2.21 | 2.48 | 2.03 |
| 2024 | 1.71 | 3.01 | 1.25 |
| 2023 | 1.45 | 1.6 | 1.26 |
| 2022 | 1.26 | 1.52 | 0.92 |
| 2021 | 0.96 | 1.41 | 0.84 |
| 2020 | 1.18 | 1.46 | 0.97 |
| 2019 | 1.5 | 1.95 | 1.28 |
| 2018 | 2.3 | 3.96 | 1.42 |
| 2017 | 3.85 | 4.61 | 3.2 |
| 2016 | 6.27 | 10.79 | 4.41 |
| 2015 | 14.55 | 37.77 | 5.67 |
| 2014 | 6.57 | 13.22 | 4.35 |
| 2013 | 9.87 | 30.71 | 3.49 |
| 2012 | 9.77 | 22.19 | 6.34 |
| 2011 | 11.63 | 13.14 | 6.69 |
| 2010 | 12.23 | 14.63 | 9.58 |
| 2009 | 8.16 | 12.24 | 4.53 |
| 2008 | 6.64 | 12.63 | 3.27 |
| 2007 | 8.37 | 12.34 | 4.24 |
| 2006 | 4.62 | 5.45 | 3.78 |
| 2005 | 8.08 | 27.61 | 4.26 |
| 2004 | 19.61 | 22.73 | 16.82 |
| 2003 | 0 | -14.63 | |
| 2002 | 10.45 | 16.04 | 7.65 |
| 2001 | 18.55 | 43.87 | 10.44 |
| 2000 | 60.31 | 115.83 | 43.41 |
| 1999 | 20.16 | 36.49 | 7.15 |
| 1998 | 3.88 | 5 | 2.89 |
| 1997 | 4.48 | 6.04 | 3.08 |