| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 1.92 | 2.22 | 1.57 |
| 2024 | 1.66 | 1.96 | 1.39 |
| 2023 | 1.91 | 2.27 | 1.63 |
| 2022 | 1.73 | 2.64 | 0.95 |
| 2021 | 2.18 | 3.43 | 1.43 |
| 2020 | 2.37 | 3.11 | 1.67 |
| 2019 | 1.62 | 1.92 | 1.37 |
| 2018 | 1.87 | 2.49 | 1.35 |
| 2017 | 3.72 | 7.68 | 2.08 |
| 2016 | 6.03 | 7.22 | 4.85 |
| 2015 | 8.05 | 15.22 | 5.38 |
| 2014 | 6.53 | 8.87 | 4.85 |
| 2013 | 6.07 | 9.48 | 3.42 |
| 2012 | 6.06 | 8.55 | 4.52 |
| 2011 | 41.64 | 50.42 | 35.04 |
| 2010 | 36.67 | 36.67 | 36.67 |
| 2009 | 7.52 | 14.21 | 2.44 |
| 2008 | 3.72 | 6.74 | 1.66 |
| 2007 | 3.96 | 7.23 | 1.26 |
| 2006 | 1.22 | 1.64 | 0.88 |
| 2005 | 1.2 | 1.7 | 0.83 |
| 2004 | 2.28 | 3.36 | 1.6 |
| 2003 | 3.42 | 4.5 | 2.55 |
| 2002 | 3.76 | 5.44 | 2.7 |
| 2001 | 7.05 | 7.95 | 5.89 |
| 2000 | 6.61 | 8.13 | 4.31 |
| 1999 | 5.16 | 6.46 | 4.1 |
| 1998 | 4.67 | 8.57 | 2.31 |
| 1997 | 2.29 | 3.06 | 1.68 |