| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 2.37 | 3.2 | 1.87 |
| 2024 | 2.52 | 3.17 | 1.86 |
| 2023 | 3.21 | 3.93 | 2.63 |
| 2022 | 4.06 | 5.41 | 2.6 |
| 2021 | 5.35 | 10.56 | 2.62 |
| 2020 | 3.43 | 5.17 | 2.6 |
| 2019 | 2.32 | 3.19 | 1.72 |
| 2018 | 2.34 | 3.53 | 1.53 |
| 2017 | 4.07 | 5.04 | 3.28 |
| 2016 | 4.87 | 5.87 | 3.87 |
| 2015 | 6.57 | 10.21 | 3.84 |
| 2014 | 4.68 | 6.66 | 3.27 |
| 2013 | 3.99 | 5.11 | 3.31 |
| 2012 | 4.16 | 5.91 | 2.87 |
| 2011 | 7.63 | 11.02 | 4.43 |
| 2010 | 5.95 | 8.53 | 3.7 |
| 2009 | 5.99 | 8 | 2.52 |
| 2008 | 4.78 | 9.43 | 1.77 |
| 2007 | 6.6 | 9.13 | 2.72 |
| 2006 | 2.25 | 2.99 | 1.44 |
| 2005 | 1.66 | 2.28 | 1.14 |
| 2004 | 3.43 | 6.14 | 2.17 |
| 2003 | 4.23 | 5.19 | 3.6 |
| 2002 | 5.11 | 6.72 | 2.92 |
| 2001 | 5.24 | 6.64 | 3.68 |
| 2000 | 5.63 | 7.85 | 2.98 |
| 1999 | 3.44 | 3.99 | 2.84 |
| 1998 | 2.5 | 3.46 | 1.84 |
| 1997 | 2.76 | 3.83 | 1.97 |