| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 2.07 | 2.53 | 1.75 |
| 2024 | 1.91 | 2.68 | 1.55 |
| 2023 | 1.97 | 2.5 | 1.53 |
| 2022 | 1.98 | 2.33 | 1.53 |
| 2021 | 1.81 | 3.26 | 0.65 |
| 2020 | 0.88 | 1.08 | 0.68 |
| 2019 | 1.23 | 1.65 | 0.89 |
| 2018 | 1.73 | 2.79 | 1.11 |
| 2017 | 3.5 | 4.61 | 2.48 |
| 2016 | 6.82 | 17.28 | 3.61 |
| 2015 | 4.53 | 9.48 | 2.98 |
| 2014 | 2.73 | 3.72 | 2.18 |
| 2013 | 2.86 | 3.55 | 2.27 |
| 2012 | 3.3 | 4.7 | 2.69 |
| 2011 | 6.12 | 7.02 | 3.04 |
| 2010 | 7.56 | 9.41 | 6.28 |
| 2009 | 3.73 | 7.26 | 1.45 |
| 2008 | 2.6 | 4.95 | 1.08 |
| 2007 | 2.95 | 4.86 | 1.15 |
| 2006 | 1.16 | 1.67 | 0.86 |
| 2005 | 1.04 | 1.38 | 0.82 |
| 2004 | 1.82 | 2.35 | 1.3 |
| 2003 | 2.37 | 3.71 | 1.68 |
| 2002 | 4.51 | 5 | 3.5 |
| 2001 | 5.12 | 6.16 | 3.5 |