| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 20.9 | 23.78 | 17.49 |
| 2024 | 11.86 | 25.32 | 6.56 |
| 2023 | 4.19 | 5.47 | 1.97 |
| 2022 | 3.71 | 4.98 | 2.68 |
| 2021 | 6.43 | 13.05 | 3.76 |
| 2020 | 1.97 | 3.61 | 1.42 |
| 2019 | 2.3 | 3.4 | 1.85 |
| 2018 | 3.28 | 6.03 | 2.09 |
| 2017 | 6.51 | 12.06 | 4.48 |
| 2016 | 4.63 | 6.6 | 3.23 |
| 2015 | 4.17 | 7.59 | 2.45 |
| 2014 | 3.03 | 3.93 | 2.08 |
| 2013 | 2.02 | 2.83 | 1.59 |
| 2012 | 1.61 | 1.94 | 1.18 |
| 2011 | 2.1 | 2.58 | 1.22 |
| 2010 | 2.69 | 3.79 | 1.84 |
| 2009 | 2.44 | 4.55 | 0.77 |
| 2008 | 1.48 | 3.71 | 0.61 |
| 2007 | 2.54 | 3.94 | 1.01 |
| 2006 | 0.89 | 1.14 | 0.68 |
| 2005 | 0.83 | 1.2 | 0.61 |
| 2004 | 1.51 | 2.14 | 1.15 |
| 2003 | 2.06 | 2.56 | 1.46 |
| 2002 | 2.68 | 3.31 | 1.88 |
| 2001 | 3.52 | 4.42 | 2.49 |
| 2000 | 4.47 | 5.21 | 3.68 |
| 1999 | 4.53 | 5.62 | 3.42 |
| 1998 | 4.38 | 6.79 | 3 |
| 1997 | 4.47 | 6.43 | 2.85 |