| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 2.31 | 2.52 | 2.12 |
| 2024 | 2.05 | 2.97 | 1.42 |
| 2023 | 1.98 | 2.34 | 1.5 |
| 2022 | 1.48 | 1.95 | 1.2 |
| 2021 | 2.14 | 2.61 | 1.85 |
| 2020 | 2.17 | 2.69 | 1.86 |
| 2019 | 2.93 | 3.75 | 2.54 |
| 2018 | 4.22 | 5.74 | 2.81 |
| 2017 | 4.36 | 5.25 | 3.7 |
| 2016 | 5.79 | 7.71 | 5.09 |
| 2015 | 9.07 | 11.34 | 7.22 |
| 2014 | 7.98 | 21.27 | 2.05 |
| 2013 | 1.33 | 2.14 | 0.92 |
| 2012 | 1.22 | 1.47 | 1.06 |
| 2011 | 1.78 | 2.4 | 1.21 |
| 2010 | 1.88 | 2.38 | 1.48 |
| 2009 | 1.58 | 2.16 | 0.92 |
| 2008 | 1.38 | 2.24 | 0.72 |
| 2007 | 2 | 2.86 | 1.07 |
| 2006 | 1.01 | 1.16 | 0.9 |
| 2005 | 1.18 | 1.63 | 0.9 |
| 2004 | 1.98 | 2.89 | 1.61 |
| 2003 | 3.08 | 4.68 | 1.87 |
| 2002 | 4.41 | 5.24 | 3.36 |
| 2001 | 4.52 | 5.34 | 3.69 |