| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 5.76 | 6.85 | 4.87 |
| 2024 | 3.56 | 7.31 | 1.75 |
| 2023 | 2.34 | 3.35 | 1.75 |
| 2022 | 2.13 | 3.17 | 1.03 |
| 2021 | 1.81 | 3.08 | 1.17 |
| 2020 | 1.17 | 2.01 | 0.64 |
| 2019 | 0.75 | 1.02 | 0.6 |
| 2018 | 0.88 | 1.33 | 0.58 |
| 2017 | 1.46 | 1.77 | 1.25 |
| 2016 | 2.1 | 3.08 | 1.51 |
| 2015 | 2.65 | 3.93 | 1.79 |
| 2014 | 2.04 | 2.56 | 1.42 |
| 2013 | 1.68 | 2.01 | 1.27 |
| 2012 | 1.28 | 1.8 | 0.97 |
| 2011 | 2.33 | 3.59 | 1.23 |
| 2010 | 2.78 | 3.96 | 1.79 |
| 2009 | 2.15 | 3.68 | 0.95 |
| 2008 | 1.58 | 3.18 | 0.78 |
| 2007 | 2.99 | 4.13 | 1.58 |
| 2006 | 1.41 | 1.81 | 1.18 |
| 2005 | 1.7 | 2.19 | 0.98 |
| 2004 | 2.35 | 3.51 | 1.04 |
| 2003 | 2.6 | 3.14 | 2.2 |
| 2002 | 4.38 | 11.4 | 2.42 |