| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 3.15 | 4.88 | 1.8 |
| 2024 | 1.62 | 2.59 | 0.92 |
| 2023 | 1.6 | 1.82 | 1.35 |
| 2022 | 1.48 | 2.01 | 1.03 |
| 2021 | 1.08 | 1.97 | 0.8 |
| 2020 | 1.14 | 1.27 | 0.98 |
| 2019 | 1.36 | 2.29 | 0.95 |
| 2018 | 1.15 | 1.56 | 0.9 |
| 2017 | 1.9 | 2.42 | 1.45 |
| 2016 | 2.11 | 2.59 | 1.61 |
| 2015 | 2.65 | 4.56 | 1.56 |
| 2014 | 2.22 | 3.12 | 1.6 |
| 2013 | 1.96 | 2.84 | 1.55 |
| 2012 | 1.73 | 2.12 | 1.38 |
| 2011 | 2.63 | 3.17 | 2.16 |
| 2010 | 3 | 3.41 | 2.36 |
| 2009 | 2.8 | 3.75 | 1.32 |
| 2008 | 2.47 | 4.96 | 0.95 |
| 2007 | 3.68 | 5.52 | 1.37 |
| 2006 | 1.47 | 2.16 | 1.09 |
| 2005 | 1.15 | 1.47 | 0.86 |
| 2004 | 1.59 | 2.09 | 1.26 |
| 2003 | 1.75 | 2.13 | 1.41 |
| 2002 | 2.41 | 2.73 | 1.72 |
| 2001 | 3.24 | 3.91 | 2.21 |
| 2000 | 4.39 | 5.14 | 3.84 |
| 1999 | 3.44 | 4.7 | 2.42 |