| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 1.24 | 1.55 | 1.01 |
| 2024 | 1.03 | 1.33 | 0.8 |
| 2023 | 1.25 | 1.51 | 1.08 |
| 2022 | 1.44 | 2.07 | 1.05 |
| 2021 | 1.82 | 3.04 | 1.38 |
| 2020 | 1.76 | 2.17 | 1.53 |
| 2019 | 2.28 | 4.34 | 0.85 |
| 2018 | 1.07 | 1.39 | 0.8 |
| 2017 | 1.8 | 2.22 | 1.33 |
| 2016 | 2.06 | 2.71 | 1.69 |
| 2015 | 3.08 | 5.33 | 1.57 |
| 2014 | 2.71 | 3.73 | 2.19 |
| 2013 | 2.53 | 3.29 | 2.14 |
| 2012 | 3.22 | 4.39 | 2 |
| 2011 | 4.72 | 6.24 | 3.48 |
| 2010 | 3.42 | 5.28 | 2.02 |
| 2009 | 2.02 | 3.05 | 1.09 |
| 2008 | 1.7 | 3.34 | 0.81 |
| 2007 | 2.27 | 3.52 | 1.01 |
| 2006 | 0.96 | 1.12 | 0.71 |
| 2005 | 0.93 | 1.16 | 0.74 |
| 2004 | 1.66 | 2.51 | 1.12 |
| 2003 | 2.54 | 3.49 | 1.92 |
| 2002 | 3.04 | 3.98 | 2.61 |
| 2001 | 4.42 | 5.17 | 3.34 |
| 2000 | 4.8 | 5.64 | 4.22 |
| 1999 | 4.19 | 5.35 | 2.84 |