| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 1.22 | 1.36 | 1.11 |
| 2024 | 1.28 | 1.56 | 1.06 |
| 2023 | 1.65 | 2.35 | 1.28 |
| 2022 | 2.13 | 3.02 | 1.71 |
| 2021 | 2.41 | 2.93 | 2.01 |
| 2020 | 3.21 | 4.45 | 2.71 |
| 2019 | 3.61 | 4.81 | 2.86 |
| 2018 | 3.77 | 5.08 | 2.95 |
| 2017 | 5.79 | 8.63 | 4.29 |
| 2016 | 5.54 | 7.32 | 4.85 |
| 2015 | 8.27 | 13.64 | 4.71 |
| 2014 | 6.64 | 10.76 | 4.18 |
| 2013 | 2.93 | 6.37 | 1.9 |
| 2012 | 2.58 | 3.47 | 1.8 |
| 2011 | 3.37 | 4.46 | 1.91 |
| 2010 | 4.09 | 5.46 | 3.05 |
| 2009 | 3.91 | 5.04 | 2.28 |
| 2008 | 4.36 | 8.51 | 1.87 |
| 2007 | 6.88 | 10.81 | 3.21 |
| 2006 | 3.65 | 7.84 | 1.87 |
| 2005 | 2.07 | 2.74 | 1.64 |
| 2004 | 2.63 | 3.69 | 2.17 |
| 2003 | 2.83 | 3.31 | 2.2 |
| 2002 | 4.61 | 6.11 | 3.75 |
| 2001 | 6.79 | 8.45 | 5.13 |
| 2000 | 6.24 | 7.14 | 4.75 |