| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 2.72 | 2.84 | 2.51 |
| 2024 | 2.87 | 4.45 | 2.24 |
| 2023 | 3.39 | 5.61 | 2.5 |
| 2022 | 2.69 | 3.57 | 2.03 |
| 2021 | 2.6 | 3.78 | 1.79 |
| 2020 | 1.7 | 2.76 | 1.22 |
| 2019 | 1.72 | 2.27 | 1.48 |
| 2018 | 2.12 | 2.78 | 1.38 |
| 2017 | 3.83 | 7.08 | 2.42 |
| 2016 | 6.44 | 7.8 | 4.69 |
| 2015 | 6.27 | 11.48 | 3.82 |
| 2014 | 3.87 | 4.61 | 3.34 |
| 2013 | 4.36 | 5.41 | 3.4 |
| 2012 | 4.84 | 6.04 | 3.66 |
| 2011 | 6.29 | 8.57 | 4.28 |
| 2010 | 6.62 | 9.08 | 4.83 |
| 2009 | 3.99 | 6.65 | 2.19 |
| 2008 | 3.36 | 5.14 | 1.88 |
| 2007 | 3.71 | 5.5 | 1.83 |
| 2006 | 1.38 | 1.9 | 0.92 |
| 2005 | 1.24 | 1.58 | 0.7 |
| 2004 | 1.85 | 2.69 | 0.96 |
| 2003 | 2.2 | 3.16 | 1.61 |
| 2002 | 3.12 | 3.51 | 2.69 |
| 2001 | 4.2 | 5.23 | 2.99 |