| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 2.33 | 2.87 | 1.79 |
| 2024 | 1.52 | 2.47 | 1.06 |
| 2023 | 2.02 | 2.96 | 1.4 |
| 2022 | 2.16 | 3.7 | 1.46 |
| 2021 | 2.21 | 3.42 | 1.51 |
| 2020 | 2.6 | 3.44 | 2.01 |
| 2019 | 2.32 | 3.15 | 1.94 |
| 2018 | 2.5 | 3.29 | 1.79 |
| 2017 | 4.48 | 6.54 | 3.07 |
| 2016 | 6.96 | 9.76 | 4.09 |
| 2015 | 5.79 | 12.1 | 3.25 |
| 2014 | 3.41 | 4.33 | 2.28 |
| 2013 | 2.51 | 3.56 | 1.91 |
| 2012 | 2.18 | 2.78 | 1.72 |
| 2011 | 3.46 | 4.42 | 2.12 |
| 2010 | 4.51 | 5.78 | 3.4 |
| 2009 | 2.9 | 5.1 | 1.36 |
| 2008 | 2.12 | 4.12 | 0.97 |
| 2007 | 3.21 | 6.58 | 1.36 |
| 2006 | 1.47 | 1.86 | 1.24 |
| 2005 | 1.82 | 2.57 | 1.31 |
| 2004 | 2.73 | 3.47 | 2.04 |
| 2003 | 2.92 | 3.36 | 2.09 |
| 2002 | 3.7 | 4.21 | 2.6 |
| 2001 | 4.91 | 5.78 | 3.57 |
| 2000 | 6.38 | 9.15 | 5.11 |