| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 2.28 | 2.44 | 2.04 |
| 2024 | 2.1 | 2.69 | 1.3 |
| 2023 | 2.42 | 3.03 | 1.88 |
| 2022 | 2.79 | 5.97 | 0.93 |
| 2021 | 1.33 | 1.85 | 1.06 |
| 2020 | 1.6 | 2.13 | 1.38 |
| 2019 | 1.55 | 2.33 | 0.96 |
| 2018 | 1.58 | 2.55 | 0.91 |
| 2017 | 2.95 | 4.12 | 2.27 |
| 2016 | 4.16 | 6.21 | 2.65 |
| 2015 | 4.13 | 6.88 | 2.94 |
| 2014 | 3.23 | 4.44 | 2.59 |
| 2013 | 2.24 | 3.31 | 1.7 |
| 2012 | 2.7 | 3.57 | 1.83 |
| 2011 | 3.42 | 4.26 | 2.91 |
| 2010 | 3.96 | 4.86 | 2.99 |
| 2009 | 3.06 | 5.1 | 1.68 |
| 2008 | 2.52 | 4.64 | 1.17 |
| 2007 | 3.38 | 5.47 | 1.32 |
| 2006 | 1.35 | 1.75 | 1.17 |
| 2005 | 1.33 | 1.77 | 0.95 |
| 2004 | 2.3 | 3.19 | 1.64 |
| 2003 | 2.99 | 3.75 | 2.22 |
| 2002 | 3.97 | 5.13 | 2.87 |
| 2001 | 6.73 | 9.04 | 4.7 |