| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2026 | 1.95 | 2.38 | 1.71 |
| 2025 | 1.7 | 1.98 | 1.48 |
| 2024 | 1.55 | 1.88 | 1.27 |
| 2023 | 1.49 | 1.79 | 1.25 |
| 2022 | 1.38 | 1.62 | 1.15 |
| 2021 | 1.5 | 1.91 | 1.14 |
| 2020 | 1.39 | 1.74 | 1.26 |
| 2019 | 1.56 | 2.46 | 1.13 |
| 2018 | 1.6 | 2.37 | 1.09 |
| 2017 | 2.32 | 2.6 | 2.22 |
| 2016 | 3.74 | 5.15 | 2.58 |
| 2015 | 2.46 | 4.3 | 1.7 |
| 2014 | 1.25 | 2.26 | 0.92 |
| 2013 | 1.16 | 1.48 | 0.92 |
| 2012 | 1.51 | 2.14 | 1.04 |
| 2011 | 3.09 | 4.33 | 1.6 |
| 2010 | 3.41 | 4.34 | 2.59 |
| 2009 | 2.41 | 3.15 | 1.5 |
| 2008 | 2.49 | 4.21 | 1.14 |
| 2007 | 3.84 | 6.05 | 1.89 |
| 2006 | 1.7 | 2.5 | 1.06 |
| 2005 | 1.27 | 1.96 | 0.86 |
| 2004 | 3.41 | 7.03 | 1.96 |
| 2003 | 4.86 | 6.33 | 2.59 |
| 2002 | 3.99 | 4.86 | 2.41 |
| 2001 | 4.7 | 6.08 | 3.03 |
| 2000 | 4.7 | 7.79 | 2.3 |
| 1999 | 2.34 | 2.91 | 1.98 |
| 1998 | 2.44 | 3.01 | 1.87 |
| 1997 | 3.26 | 4.63 | 2.38 |