| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 3.01 | 4.49 | 2.36 |
| 2024 | 1.15 | 3.75 | 0.71 |
| 2023 | 1.16 | 1.37 | 1.01 |
| 2022 | 1.17 | 1.71 | 0.98 |
| 2021 | 1.15 | 1.33 | 1.03 |
| 2020 | 1.44 | 1.79 | 1.19 |
| 2019 | 1.4 | 1.7 | 1.04 |
| 2018 | 1.55 | 2.2 | 1.03 |
| 2017 | 2.08 | 2.53 | 1.61 |
| 2016 | 1.76 | 2.38 | 1.43 |
| 2015 | 2.09 | 3.22 | 1.41 |
| 2014 | 1.86 | 2.11 | 1.58 |
| 2013 | 1.47 | 1.72 | 1.19 |
| 2012 | 1.87 | 2.48 | 1.37 |
| 2011 | 3.09 | 4 | 2.13 |
| 2010 | 3.81 | 4.83 | 2.98 |
| 2009 | 3.47 | 4.47 | 2.89 |
| 2008 | 4.56 | 7.78 | 2.58 |
| 2007 | 5.5 | 7.01 | 3.5 |
| 2006 | 2.28 | 3.57 | 1.43 |
| 2005 | 1.25 | 1.44 | 1.02 |
| 2004 | 1.44 | 1.72 | 1.21 |
| 2003 | 1.66 | 2.1 | 1.29 |
| 2002 | 2.65 | 3.7 | 2.2 |
| 2001 | 3.75 | 4.52 | 2.6 |
| 2000 | 3.44 | 4.29 | 2.47 |
| 1999 | 4.81 | 7.09 | 3.17 |
| 1998 | 5.81 | 7.9 | 2.59 |