| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 1.28 | 1.69 | 1.11 |
| 2024 | 1.12 | 1.48 | 0.76 |
| 2023 | 1.19 | 1.32 | 1.06 |
| 2022 | 1.32 | 1.62 | 1.08 |
| 2021 | 1.64 | 2.23 | 1.37 |
| 2020 | 1.38 | 1.95 | 1.04 |
| 2019 | 1.42 | 2.11 | 1.12 |
| 2018 | 1.87 | 2.83 | 1.24 |
| 2017 | 10.06 | 36.01 | 2.4 |
| 2016 | 7.72 | 10.29 | 5.14 |
| 2015 | 3.26 | 8.89 | 1.54 |
| 2014 | 1.32 | 1.97 | 1.07 |
| 2013 | 1.4 | 1.65 | 1.2 |
| 2012 | 1.75 | 2.21 | 1.37 |
| 2011 | 2.59 | 3.23 | 1.69 |
| 2010 | 2.42 | 3.05 | 1.79 |
| 2009 | 2.11 | 2.55 | 1.46 |
| 2008 | 2.49 | 4.72 | 1.09 |
| 2007 | 3.73 | 5.66 | 1.39 |
| 2006 | 1.24 | 1.57 | 1.03 |
| 2005 | 1.4 | 1.85 | 1.01 |
| 2004 | 2.15 | 2.88 | 1.81 |
| 2003 | 2.93 | 3.77 | 2.14 |
| 2002 | 3.7 | 4.47 | 2.69 |
| 2001 | 7.91 | 16.96 | 3.83 |
| 2000 | 10.42 | 14.62 | 6.46 |
| 1999 | 5.55 | 7.05 | 3.37 |