| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 1.16 | 1.32 | 1.09 |
| 2024 | 1.31 | 1.72 | 1.04 |
| 2023 | 1.44 | 1.72 | 1.23 |
| 2022 | 1.78 | 2.88 | 1.17 |
| 2021 | 1.97 | 2.95 | 1.25 |
| 2020 | 1.27 | 1.51 | 1.07 |
| 2019 | 1.51 | 1.86 | 1.28 |
| 2018 | 1.83 | 2.58 | 1.28 |
| 2017 | 2.47 | 3.24 | 1.88 |
| 2016 | 2.51 | 3.25 | 1.93 |
| 2015 | 3.01 | 5 | 1.66 |
| 2014 | 2.19 | 3.05 | 1.5 |
| 2013 | 2.82 | 4.14 | 1.66 |
| 2012 | 3.57 | 4.56 | 2.92 |
| 2011 | 5.37 | 7.86 | 2.96 |
| 2010 | 5.78 | 9.29 | 2.92 |
| 2009 | 6.11 | 10.06 | 2.32 |
| 2008 | 6.98 | 18.57 | 1.76 |
| 2007 | 11.8 | 27.12 | 2.73 |
| 2006 | 2.12 | 3.04 | 1.71 |
| 2005 | 2.09 | 2.95 | 1.67 |
| 2004 | 2.78 | 3.39 | 2.32 |
| 2003 | 1.99 | 2.54 | 1.73 |
| 2002 | 2.3 | 2.56 | 1.75 |
| 2001 | 3.33 | 4.09 | 2.21 |