| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 1.39 | 1.46 | 1.29 |
| 2024 | 1.47 | 1.75 | 1.26 |
| 2023 | 1.92 | 2.11 | 1.53 |
| 2022 | 1.9 | 2.23 | 1.67 |
| 2021 | 2.29 | 3.16 | 2 |
| 2020 | 2.11 | 3.27 | 1.51 |
| 2019 | 2.06 | 2.46 | 1.85 |
| 2018 | 2.72 | 3.35 | 1.91 |
| 2017 | 2.9 | 3.29 | 2.54 |
| 2016 | 3.29 | 3.93 | 2.95 |
| 2015 | 3.92 | 5.31 | 2.91 |
| 2014 | 2.91 | 3.69 | 2.43 |
| 2013 | 4.09 | 6.18 | 2.99 |
| 2012 | 8.55 | 12.84 | 4.82 |
| 2011 | 13.45 | 16.14 | 10.88 |
| 2010 | 14.79 | 21.24 | 10.65 |
| 2009 | 11.54 | 15.58 | 8.8 |
| 2008 | 15.79 | 25.28 | 9.03 |
| 2007 | 16.66 | 22.4 | 12.48 |
| 2006 | 8.83 | 14.13 | 5.2 |
| 2005 | 3.07 | 5.23 | 2.02 |
| 2004 | 1.91 | 2.23 | 1.61 |
| 2003 | 1.59 | 1.82 | 1.33 |
| 2002 | 2.1 | 2.41 | 1.69 |
| 2001 | 2.87 | 3.49 | 2.06 |