| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 7.54 | 8.51 | 6.71 |
| 2024 | 9.57 | 14.65 | 7.27 |
| 2023 | 13.94 | 17.29 | 11.93 |
| 2022 | 13.76 | 17.7 | 10.12 |
| 2021 | 10.84 | 15.82 | 7.23 |
| 2020 | 9.21 | 10.33 | 8.51 |
| 2019 | 10.91 | 16.05 | 9.3 |
| 2018 | 13.61 | 23.58 | 8.42 |
| 2017 | 31.11 | 52.49 | 21.41 |
| 2016 | 37.74 | 76.36 | 13.85 |
| 2015 | 25.72 | 40.16 | 15.81 |
| 2014 | 15.3 | 23.81 | 5.62 |
| 2013 | 9.06 | 11.14 | 6.81 |
| 2012 | 8.2 | 11.41 | 6.38 |
| 2011 | 7.49 | 11.09 | 2.86 |
| 2010 | 3.71 | 4.56 | 2.97 |
| 2009 | 3.4 | 4.59 | 2.13 |
| 2008 | 3.84 | 8.83 | 1.17 |
| 2007 | 4.93 | 9.49 | 1.8 |
| 2006 | 1.88 | 2.42 | 1.26 |
| 2005 | 1.66 | 2.71 | 1.07 |
| 2004 | 3.03 | 4.04 | 2.21 |
| 2003 | 3.5 | 4.72 | 2.65 |
| 2002 | 5.41 | 6.77 | 4.03 |
| 2001 | 4.67 | 5.42 | 3.92 |
| 2000 | 3.91 | 5.03 | 2.83 |