| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 3.43 | 3.74 | 3.15 |
| 2024 | 3.63 | 4.76 | 2.75 |
| 2023 | 3.73 | 6.03 | 2.94 |
| 2022 | 2.82 | 4.27 | 1.86 |
| 2021 | 2.51 | 3.51 | 2.11 |
| 2020 | 3.89 | 6.33 | 3.03 |
| 2019 | 3.44 | 4.58 | 1.43 |
| 2018 | 1.85 | 2.41 | 1.36 |
| 2017 | 5.06 | 13.57 | 2.07 |
| 2016 | 10.38 | 13.16 | 3.94 |
| 2015 | 5.02 | 9.97 | 2.97 |
| 2014 | 1.96 | 3.62 | 1.6 |
| 2013 | 1.7 | 1.88 | 1.43 |
| 2012 | 1.58 | 1.97 | 1.31 |
| 2011 | 1.89 | 2.43 | 1.32 |
| 2010 | 2.18 | 2.67 | 1.66 |
| 2009 | 1.81 | 2.57 | 1.12 |
| 2008 | 2.02 | 3.42 | 0.84 |
| 2007 | 2.88 | 3.94 | 1.73 |
| 2006 | 1.88 | 2.51 | 1.48 |
| 2005 | 2.15 | 3.15 | 1.08 |
| 2004 | 3.71 | 4.75 | 2.9 |
| 2003 | 5.64 | 6.86 | 3.81 |
| 2002 | 6.7 | 8.57 | 5.47 |
| 2001 | 8.47 | 10.17 | 5.92 |
| 2000 | 6.68 | 7.82 | 4.23 |
| 1999 | 4.31 | 5.42 | 3.67 |
| 1998 | 5.14 | 6.94 | 3.6 |
| 1997 | 4.16 | 5.97 | 2.53 |