| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 3.68 | 4.47 | 3.4 |
| 2024 | 4.08 | 5.49 | 3.25 |
| 2023 | 13.63 | 32.71 | 4.55 |
| 2022 | 19.02 | 33.15 | 3.58 |
| 2021 | 4.02 | 6.25 | 1.37 |
| 2020 | 1.46 | 2.07 | 1.25 |
| 2019 | 1.8 | 2.42 | 1.45 |
| 2018 | 1.72 | 2.08 | 1.37 |
| 2017 | 2.29 | 2.73 | 1.85 |
| 2016 | 2.67 | 3.6 | 2.32 |
| 2015 | 4.92 | 13.6 | 2.46 |
| 2014 | 1.8 | 2.77 | 1.46 |
| 2013 | 2.28 | 3.83 | 1.63 |
| 2012 | 2.43 | 3.68 | 1.57 |
| 2011 | 2.73 | 3.45 | 2.28 |
| 2010 | 2.29 | 3.1 | 1.34 |
| 2009 | 1.96 | 2.97 | 0.79 |
| 2008 | 1.16 | 2 | 0.65 |
| 2007 | 1.93 | 3.25 | 0.85 |
| 2006 | 0.81 | 0.99 | 0.68 |
| 2005 | 0.8 | 1.18 | 0.54 |
| 2004 | 1.45 | 1.81 | 1.11 |
| 2003 | 1.42 | 1.68 | 1.1 |
| 2002 | 1.82 | 2.24 | 1.6 |
| 2001 | 2.47 | 2.92 | 1.81 |
| 2000 | 2.76 | 3.62 | 1.93 |
| 1999 | 4.45 | 5.63 | 3.34 |
| 1998 | 5.06 | 6.49 | 3.94 |
| 1997 | 5.48 | 8.17 | 3.21 |