| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 2.13 | 2.28 | 1.92 |
| 2024 | 2.18 | 2.63 | 1.7 |
| 2023 | 3.81 | 5.72 | 2.46 |
| 2022 | 4.64 | 8.04 | 3.01 |
| 2021 | 2.54 | 4.29 | 1.72 |
| 2020 | 2.04 | 2.7 | 1.73 |
| 2019 | 3.46 | 5.28 | 2.44 |
| 2018 | 5.15 | 6.97 | 4.05 |
| 2017 | 3.43 | 7.22 | 2.65 |
| 2016 | 2.74 | 3.44 | 2.31 |
| 2015 | 3.05 | 5.6 | 1.68 |
| 2014 | 1.36 | 2.19 | 1.06 |
| 2013 | 1.6 | 2.35 | 1.18 |
| 2012 | 2.44 | 3.37 | 1.7 |
| 2011 | 3.81 | 5.14 | 1.95 |
| 2010 | 3.22 | 4.26 | 2.94 |
| 2009 | 3.29 | 4.31 | 2.83 |
| 2008 | 3.18 | 5.07 | 2.06 |
| 2007 | 3.09 | 4.87 | 1.34 |
| 2006 | 1.01 | 1.37 | 0.73 |
| 2005 | 0.86 | 1.02 | 0.62 |
| 2004 | 1.28 | 2.09 | 0.95 |
| 2003 | 1.43 | 1.81 | 1.25 |
| 2002 | 1.64 | 1.88 | 1.49 |
| 2001 | 1.9 | 2.19 | 1.67 |
| 2000 | 1.72 | 2.02 | 1.32 |
| 1999 | 1.68 | 2.41 | 1.25 |
| 1998 | 4.6 | 7.47 | 2.79 |
| 1997 | 3.81 | 5.6 | 2.64 |