| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 2.12 | 2.59 | 1.78 |
| 2024 | 2.7 | 5.17 | 1.52 |
| 2023 | 2.09 | 2.95 | 1.61 |
| 2022 | 2.97 | 3.9 | 2.12 |
| 2021 | 2.46 | 3.6 | 1.8 |
| 2020 | 2.05 | 2.89 | 1.31 |
| 2019 | 1.14 | 1.47 | 0.95 |
| 2018 | 1.19 | 1.64 | 0.95 |
| 2017 | 1.53 | 2.08 | 1.18 |
| 2016 | 2.42 | 4.28 | 1.68 |
| 2015 | 1.83 | 2.64 | 1.44 |
| 2014 | 1.11 | 1.64 | 0.93 |
| 2013 | 1.2 | 1.51 | 1 |
| 2012 | 1.36 | 1.74 | 1.17 |
| 2011 | 1.96 | 2.49 | 1.26 |
| 2010 | 2.74 | 3.63 | 2.19 |
| 2009 | 3.63 | 5.49 | 1.69 |
| 2008 | 2.81 | 6.19 | 1.25 |
| 2007 | 9.24 | 16.15 | 4.07 |
| 2006 | 3.71 | 10.58 | 1.85 |
| 2005 | 1.84 | 2.82 | 1.36 |
| 2004 | 2.9 | 4.65 | 2.15 |
| 2003 | 4.25 | 5.49 | 2.65 |
| 2002 | 6.85 | 7.88 | 5.07 |
| 2001 | 6.5 | 7.6 | 4.86 |