| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 2.32 | 3.38 | 1.71 |
| 2024 | 1.72 | 2.19 | 1.19 |
| 2023 | 2.02 | 2.4 | 1.74 |
| 2022 | 2.01 | 2.55 | 1.67 |
| 2021 | 1.77 | 2.02 | 1.51 |
| 2020 | 2.11 | 2.66 | 1.88 |
| 2019 | 1.94 | 2.92 | 1.53 |
| 2018 | 1.82 | 2.49 | 1.21 |
| 2017 | 2.95 | 4.17 | 2.3 |
| 2016 | 3.47 | 4.93 | 2.27 |
| 2015 | 2.55 | 4.62 | 1.95 |
| 2014 | 1.72 | 2.33 | 1.42 |
| 2013 | 1.4 | 1.76 | 1.15 |
| 2012 | 1.55 | 2.07 | 1.15 |
| 2011 | 2.11 | 2.77 | 1.42 |
| 2010 | 1.81 | 2.2 | 1.47 |
| 2009 | 1.57 | 1.96 | 0.88 |
| 2008 | 1.41 | 2.58 | 0.71 |
| 2007 | 2.38 | 3.49 | 1.49 |
| 2006 | 1.51 | 1.94 | 1.25 |
| 2005 | 2.15 | 3.38 | 1.33 |
| 2004 | 4.06 | 6.21 | 2.9 |
| 2003 | 4.24 | 5.5 | 3.3 |
| 2002 | 6.1 | 7.62 | 4.81 |
| 2001 | 10.16 | 12.79 | 7.06 |