| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 3.57 | 3.92 | 3.11 |
| 2024 | 3.35 | 5.19 | 2.22 |
| 2023 | 3.83 | 5.08 | 3.14 |
| 2022 | 3.22 | 3.99 | 2.64 |
| 2021 | 3.67 | 5.23 | 2.77 |
| 2020 | 7.25 | 12.59 | 4.31 |
| 2019 | 3.84 | 7.35 | 2.91 |
| 2018 | 4.16 | 5.9 | 2.75 |
| 2017 | 5.22 | 7.14 | 3.88 |
| 2016 | 7.1 | 7.97 | 5.3 |
| 2015 | 6.29 | 11.57 | 3.87 |
| 2014 | 3.42 | 5.41 | 2.31 |
| 2013 | 2.69 | 3.19 | 2.3 |
| 2012 | 3.77 | 10.25 | 2.19 |
| 2011 | 7.31 | 8.64 | 5.44 |
| 2010 | 7.52 | 9.64 | 5.69 |
| 2009 | 6.52 | 9.64 | 3.08 |
| 2008 | 6.26 | 10.92 | 2.63 |
| 2007 | 4 | 6.54 | 1.94 |
| 2006 | 1.75 | 2.12 | 1.36 |
| 2005 | 1.55 | 1.87 | 1.15 |
| 2004 | 3.03 | 5.6 | 1.75 |
| 2003 | 3.01 | 4.27 | 2.13 |
| 2002 | 4.38 | 4.96 | 3.34 |
| 2001 | 5.54 | 6.9 | 3.58 |
| 2000 | 5.69 | 6.93 | 4.7 |