| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 4.5 | 6.58 | 2.67 |
| 2024 | 1.59 | 3.12 | 1.13 |
| 2023 | 1.88 | 2.1 | 1.73 |
| 2022 | 1.78 | 2.44 | 1.29 |
| 2021 | 1.66 | 2.29 | 1.43 |
| 2020 | 1.62 | 2.28 | 1.29 |
| 2019 | 1.62 | 2.05 | 1.4 |
| 2018 | 1.67 | 1.99 | 1.25 |
| 2017 | 2.62 | 3.53 | 1.87 |
| 2016 | 2.93 | 3.44 | 2.28 |
| 2015 | 3.33 | 5.1 | 2.08 |
| 2014 | 2.28 | 3.24 | 1.59 |
| 2013 | 1.83 | 2.26 | 1.47 |
| 2012 | 2.4 | 3.47 | 1.63 |
| 2011 | 5.38 | 8.41 | 2.53 |
| 2010 | 6.46 | 8.43 | 5.05 |
| 2009 | 5.5 | 7.99 | 2.84 |
| 2008 | 7.08 | 15.65 | 2.03 |
| 2007 | 10.82 | 14.04 | 7.22 |
| 2006 | 2.89 | 3.67 | 2.04 |
| 2005 | 2.18 | 3.36 | 1.18 |
| 2004 | 2.06 | 2.5 | 1.61 |
| 2003 | 2.15 | 2.68 | 1.85 |
| 2002 | 3.39 | 4.06 | 2.82 |
| 2001 | 4.86 | 5.98 | 3.27 |
| 2000 | 4.99 | 5.8 | 2.48 |
| 1999 | 3.51 | 4.06 | 2.75 |