| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 1.43 | 3.74 | 0.37 |
| 2024 | 3.82 | 5.34 | 2.89 |
| 2023 | 3.15 | 3.99 | 2.73 |
| 2022 | 2.76 | 3.63 | 2.09 |
| 2021 | 2.31 | 3.65 | 1.35 |
| 2020 | 2.01 | 3.53 | 1.57 |
| 2019 | 1.67 | 2.28 | 1.42 |
| 2018 | 2.05 | 2.81 | 1.23 |
| 2017 | 3.49 | 4.8 | 2.49 |
| 2016 | 8.62 | 12.4 | 4.44 |
| 2015 | 13.08 | 26.21 | 7.7 |
| 2014 | 7.45 | 8.78 | 6.44 |
| 2013 | 8.12 | 12.64 | 4.93 |
| 2012 | 6.12 | 8.21 | 4.12 |
| 2011 | 7.92 | 11.76 | 4.65 |
| 2010 | 4.59 | 6.2 | 3.67 |
| 2009 | 3.18 | 4.64 | 1.86 |
| 2008 | 2.99 | 4.91 | 1.4 |
| 2007 | 4.22 | 6.53 | 2.15 |
| 2006 | 3.59 | 4.75 | 1.97 |
| 2005 | 4.75 | 5.77 | 3.57 |
| 2004 | 4.83 | 6.35 | 4.37 |
| 2003 | 6.2 | 6.73 | 4.09 |
| 2002 | 7.01 | 11.13 | 5.56 |
| 2001 | 9.71 | 11.89 | 7.05 |
| 2000 | 5.64 | 7.74 | 4.45 |