| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 2.81 | 4.5 | 2.2 |
| 2024 | 2.19 | 3.06 | 1.66 |
| 2023 | 3.03 | 3.88 | 2.32 |
| 2022 | 3.81 | 5.5 | 2.68 |
| 2021 | 1.64 | 3.31 | 1.36 |
| 2020 | 2.1 | 2.69 | 1.61 |
| 2019 | 1.98 | 2.55 | 1.61 |
| 2018 | 2.11 | 2.97 | 1.49 |
| 2017 | 3.21 | 3.94 | 2.44 |
| 2016 | 3.83 | 4.45 | 2.93 |
| 2015 | 7.2 | 10 | 4.13 |
| 2014 | 4.74 | 7.45 | 3.56 |
| 2013 | 4.14 | 5.28 | 3.29 |
| 2012 | 2.36 | 3.57 | 1.59 |
| 2011 | 2.45 | 3.1 | 1.85 |
| 2010 | 3.02 | 3.76 | 2.21 |
| 2009 | 2.25 | 3.53 | 1.01 |
| 2008 | 1.92 | 3.52 | 0.76 |
| 2007 | 3.17 | 5.1 | 2.09 |
| 2006 | 2.03 | 2.91 | 1.16 |
| 2005 | 1.44 | 2.2 | 0.57 |
| 2004 | 1.06 | 1.66 | 0.74 |