| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 4.5 | 6.19 | 3.39 |
| 2024 | 2.72 | 4.21 | 2.15 |
| 2023 | 2.48 | 3.69 | 1.7 |
| 2022 | 1.79 | 2.12 | 1.45 |
| 2021 | 1.98 | 2.46 | 1.73 |
| 2020 | 2.05 | 3.35 | 1.36 |
| 2019 | 1.82 | 2.25 | 1.57 |
| 2018 | 2.15 | 3.02 | 1.53 |
| 2017 | 3.77 | 4.76 | 2.85 |
| 2016 | 4.16 | 5.18 | 3.43 |
| 2015 | 6.64 | 11.54 | 3.39 |
| 2014 | 1.98 | 4.02 | 1.51 |
| 2013 | 2.01 | 2.5 | 1.6 |
| 2012 | 2.56 | 3.21 | 1.98 |
| 2011 | 4.62 | 7.06 | 2.32 |
| 2010 | 5.16 | 7.24 | 3.81 |
| 2009 | 4.2 | 5.28 | 3.02 |
| 2008 | 6.73 | 10.35 | 2.36 |
| 2007 | 8.59 | 11.93 | 6.17 |
| 2006 | 6.51 | 8.27 | 4.19 |
| 2005 | 4.22 | 5.06 | 3.11 |
| 2004 | 4.55 | 8.6 | 3.3 |
| 2003 | 5.54 | 6.44 | 4.71 |