| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2026 | 9.97 | 14.9 | 7.29 |
| 2025 | 7.61 | 10.57 | 4.32 |
| 2024 | 2.94 | 5.06 | 2.08 |
| 2023 | 3.7 | 4.22 | 3.26 |
| 2022 | 3.73 | 5.1 | 2.87 |
| 2021 | 3.81 | 4.84 | 2.94 |
| 2020 | 3.73 | 4.36 | 2.97 |
| 2019 | 3.52 | 4.49 | 3.18 |
| 2018 | 4.72 | 8.14 | 2.96 |
| 2017 | 8.73 | 10.23 | 7.93 |
| 2016 | 6.41 | 9.09 | 4.69 |
| 2015 | 5.04 | 9.03 | 3.17 |
| 2014 | 3.05 | 4.32 | 2.04 |
| 2013 | 2.19 | 2.47 | 1.7 |
| 2012 | 1.85 | 2.23 | 1.48 |
| 2011 | 2.78 | 3.72 | 1.63 |
| 2010 | 2.13 | 2.61 | 1.57 |
| 2009 | 1.69 | 2.36 | 1.09 |
| 2008 | 1.51 | 2.69 | 0.74 |
| 2007 | 2.07 | 3.45 | 1.17 |
| 2006 | 1.05 | 1.27 | 0.79 |
| 2005 | 0.87 | 1.14 | 0.62 |
| 2004 | 1.5 | 2.12 | 1.08 |
| 2003 | 2 | 2.46 | 1.54 |
| 2002 | 2.76 | 3.28 | 2.17 |