| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2024 | 1.23 | 1.5 | 1.05 |
| 2023 | 1.33 | 1.54 | 1.04 |
| 2022 | 1.08 | 1.47 | 0.77 |
| 2021 | 2.32 | 4.12 | 1.07 |
| 2020 | 2.77 | 4.08 | 1.75 |
| 2019 | 1.79 | 2.45 | 1.22 |
| 2018 | 1.55 | 2.25 | 1.18 |
| 2017 | 2.09 | 2.58 | 1.57 |
| 2016 | 1.68 | 2.38 | 1.27 |
| 2015 | 1.78 | 2.7 | 1.16 |
| 2014 | 1.34 | 2.08 | 1.06 |
| 2013 | 1.23 | 1.61 | 0.92 |
| 2012 | 1.32 | 1.6 | 1.03 |
| 2011 | 2.3 | 3.48 | 1.35 |
| 2010 | 3.41 | 5.02 | 2.33 |
| 2009 | 3.73 | 4.79 | 2.24 |
| 2008 | 5.16 | 12.76 | 1.7 |
| 2007 | 10.41 | 17.15 | 5.99 |
| 2006 | 4.65 | 6.36 | 3.03 |
| 2005 | 5.23 | 8.12 | 3.73 |
| 2004 | 10.25 | 12.61 | 8 |
| 2003 | 9.66 | 11.68 | 5.68 |
| 2002 | 3.67 | 4.29 | 2.51 |
| 2001 | 4.06 | 4.74 | 3.52 |
| 2000 | 3.64 | 4.58 | 2.58 |