| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2024 | 3.2 | 4.19 | 2.37 |
| 2023 | 2.84 | 3.5 | 2.31 |
| 2022 | 2.93 | 4.28 | 2.3 |
| 2021 | 5.29 | 7.78 | 4.09 |
| 2020 | 7.11 | 9.29 | 5.72 |
| 2019 | 5.52 | 9.91 | 3.31 |
| 2018 | 3.67 | 4.93 | 2.79 |
| 2017 | 3.79 | 4.74 | 2.92 |
| 2016 | 3.06 | 4.45 | 2.3 |
| 2015 | 3.03 | 4.85 | 2.14 |
| 2014 | 2.14 | 2.68 | 1.55 |
| 2013 | 1.68 | 1.96 | 1.39 |
| 2012 | 1.82 | 2.37 | 1.29 |
| 2011 | 3.32 | 4.52 | 1.94 |
| 2010 | 4.42 | 5.72 | 3.03 |
| 2009 | 3.59 | 4.89 | 2.03 |
| 2008 | 3.76 | 8.23 | 1.65 |
| 2007 | 7.43 | 9.48 | 5.12 |
| 2006 | 4.43 | 5.32 | 2.94 |
| 2005 | 2.93 | 4.25 | 1.78 |
| 2004 | 6.7 | 9.94 | 4.18 |
| 2003 | 5.51 | 6.37 | 4.46 |
| 2002 | 5.02 | 6.14 | 3.34 |
| 2001 | 7.1 | 13.35 | 4.17 |
| 2000 | 11.63 | 15.49 | 6.26 |
| 1999 | 4.61 | 6.54 | 2.92 |