| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 3.26 | 5.71 | 2.74 |
| 2024 | 2.84 | 4.2 | 1.54 |
| 2023 | 2.43 | 2.8 | 2.18 |
| 2022 | 2.61 | 3.35 | 2.04 |
| 2021 | 2.18 | 3.13 | 1.56 |
| 2020 | 2.71 | 3.44 | 2.03 |
| 2019 | 2.39 | 3.18 | 1.52 |
| 2018 | 1.84 | 2.51 | 1.29 |
| 2017 | 3.13 | 3.97 | 2.43 |
| 2016 | 3.4 | 4.16 | 2.75 |
| 2015 | 4.24 | 7.19 | 2.63 |
| 2014 | 3.86 | 4.79 | 3.33 |
| 2013 | 3.85 | 4.64 | 3.19 |
| 2012 | 4.48 | 6 | 3.36 |
| 2011 | 6.53 | 9.18 | 4.23 |
| 2010 | 8.49 | 11.14 | 6.7 |
| 2009 | 8.72 | 14.28 | 5.64 |
| 2008 | 10.48 | 19.79 | 4.45 |
| 2007 | 21.25 | 34.65 | 14.42 |
| 2006 | 10.39 | 18.31 | 1.17 |
| 2005 | 1.62 | 2.34 | 1.07 |
| 2004 | 3.2 | 4.63 | 2.3 |
| 2003 | 3.61 | 4.28 | 2.14 |