| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 4.65 | 5.95 | 3.67 |
| 2024 | 2.46 | 5.32 | 1.89 |
| 2023 | 2.95 | 3.78 | 2.4 |
| 2022 | 3.65 | 4.61 | 2.77 |
| 2021 | 3.26 | 4.74 | 2.51 |
| 2020 | 1.81 | 3.1 | 0.7 |
| 2019 | 1.33 | 1.7 | 0.85 |
| 2018 | 1.34 | 2.03 | 0.79 |
| 2017 | 2.38 | 3.08 | 1.88 |
| 2016 | 2.42 | 2.82 | 2.14 |
| 2015 | 4.93 | 10.45 | 2.16 |
| 2014 | 3.11 | 4.92 | 2.04 |
| 2013 | 2.24 | 3.66 | 1.68 |
| 2012 | 2.4 | 3.08 | 1.8 |
| 2011 | 3.92 | 5.67 | 2.28 |
| 2010 | 3.1 | 4.61 | 2.15 |
| 2009 | 2.69 | 3.58 | 1.34 |
| 2008 | 2.79 | 6.22 | 0.95 |
| 2007 | 3.67 | 5.14 | 1.93 |
| 2006 | 1.87 | 2.76 | 1.35 |
| 2005 | 1.34 | 1.71 | 0.97 |
| 2004 | 1.95 | 2.46 | 1.54 |
| 2003 | 2.22 | 2.89 | 1.66 |
| 2002 | 3.82 | 4.53 | 3.44 |
| 2001 | 6.03 | 7.79 | 3.79 |