| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 1.92 | 2.58 | 1.58 |
| 2024 | 1.68 | 2.27 | 1.16 |
| 2023 | 1.96 | 2.44 | 1.74 |
| 2022 | 1.95 | 2.78 | 1.56 |
| 2021 | 2.39 | 2.85 | 1.9 |
| 2020 | 3.09 | 3.76 | 2.55 |
| 2019 | 2.29 | 2.93 | 1.66 |
| 2018 | 2.32 | 3.54 | 1.73 |
| 2017 | 4.1 | 6.62 | 2.38 |
| 2016 | 8.3 | 12.07 | 5.84 |
| 2015 | 10.9 | 17.71 | 4.75 |
| 2014 | 6.84 | 10.17 | 4.83 |
| 2013 | 0 | -4.53 | |
| 2012 | 0 | -3.7 | |
| 2011 | 0 | -3.89 | |
| 2010 | 0 | -5.39 | |
| 2009 | 0 | -2.76 | |
| 2008 | 0 | -1.69 | |
| 2007 | 0 | -2.47 | |
| 2006 | 0 | -2.53 | |
| 2005 | 0 | -4.45 | |
| 2004 | 38.48 | 41.41 | 37.14 |
| 2003 | 37.79 | 48.28 | 20.21 |
| 2002 | 18.69 | 25.43 | 13.4 |
| 2001 | 18.04 | 21.78 | 14.45 |
| 2000 | 14.56 | 23.91 | 8.73 |
| 1999 | 7.53 | 11.3 | 5.06 |
| 1998 | 6.19 | 9.89 | 3.7 |
| 1997 | 3.9 | 5.82 | 2.92 |