| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 2.66 | 4.58 | 1.88 |
| 2024 | 1.8 | 2.68 | 1.18 |
| 2023 | 1.85 | 2.16 | 1.55 |
| 2022 | 1.68 | 1.95 | 1.33 |
| 2021 | 1.57 | 1.9 | 1.24 |
| 2020 | 1.79 | 2.25 | 1.47 |
| 2019 | 1.88 | 2.47 | 1.42 |
| 2018 | 1.88 | 2.66 | 1.38 |
| 2017 | 5.33 | 11.13 | 2.53 |
| 2016 | 9.28 | 12.57 | 7.35 |
| 2015 | 12.55 | 19.78 | 7.91 |
| 2014 | 7.01 | 13.87 | 3.95 |
| 2013 | 4 | 5.46 | 2.78 |
| 2012 | 3.26 | 4.05 | 2.29 |
| 2011 | 5 | 5.93 | 3.68 |
| 2010 | 8.22 | 12.25 | 4.33 |
| 2009 | 8.66 | 11.97 | 3.79 |
| 2008 | 6.21 | 11.74 | 2.43 |
| 2007 | 6.83 | 9.99 | 3.34 |
| 2006 | 3.14 | 4.94 | 2.1 |
| 2005 | 2.43 | 3.47 | 1.69 |
| 2004 | 4.63 | 8.22 | 2.97 |
| 2003 | 9.7 | 12.85 | 4.39 |
| 2002 | 14.05 | 18.34 | 9.92 |
| 2001 | 8.81 | 11.12 | 6.8 |
| 2000 | 7.37 | 9.24 | 6.35 |