| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 3.02 | 5.49 | 1.79 |
| 2024 | 3.36 | 3.97 | 2.61 |
| 2023 | 2.6 | 3.26 | 2.07 |
| 2022 | 2.1 | 2.7 | 1.42 |
| 2021 | 1.83 | 2.9 | 1.37 |
| 2020 | 2.58 | 5.42 | 1.6 |
| 2019 | 1.89 | 2.87 | 1.14 |
| 2018 | 1.41 | 2.32 | 0.87 |
| 2017 | 2.26 | 2.55 | 2 |
| 2016 | 1.89 | 2.68 | 1.64 |
| 2015 | 3.37 | 5.45 | 2.42 |
| 2014 | 2.07 | 3.5 | 1.41 |
| 2013 | 1.53 | 1.96 | 1.19 |
| 2012 | 1.73 | 2.34 | 1.37 |
| 2011 | 2.68 | 3.71 | 1.55 |
| 2010 | 3 | 4.01 | 2.42 |
| 2009 | 3.59 | 5.24 | 2.37 |
| 2008 | 7.15 | 22.59 | 2.04 |
| 2007 | 30.46 | 140.39 | 6.85 |
| 2006 | 5.36 | 8.04 | 3 |
| 2005 | 3.63 | 4.48 | 2.62 |
| 2004 | 3.54 | 4.26 | 2.74 |
| 2003 | 3.5 | 4.46 | 2.52 |
| 2002 | 4.54 | 5.37 | 3.18 |
| 2001 | 5.3 | 6.62 | 4 |
| 2000 | 3.84 | 4.96 | 2.66 |
| 1999 | 3.01 | 4.02 | 2.36 |