| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 2.12 | 2.58 | 1.94 |
| 2024 | 2.34 | 3.09 | 1.97 |
| 2023 | 3.73 | 5.35 | 2.96 |
| 2022 | 3.42 | 7.77 | 1.58 |
| 2021 | 1.64 | 2.15 | 1.36 |
| 2020 | 2.1 | 2.65 | 1.59 |
| 2019 | 1.61 | 2.18 | 1.31 |
| 2018 | 2.05 | 3.18 | 1.28 |
| 2017 | 3.26 | 4.32 | 2.89 |
| 2016 | 2.86 | 3.57 | 2.4 |
| 2015 | 2.96 | 4.6 | 1.84 |
| 2014 | 1.69 | 2.46 | 1.22 |
| 2013 | 1.24 | 1.48 | 1.02 |
| 2012 | 1.35 | 1.72 | 1.05 |
| 2011 | 1.95 | 2.36 | 1.38 |
| 2010 | 2.31 | 2.88 | 1.68 |
| 2009 | 1.9 | 2.7 | 1.21 |
| 2008 | 1.69 | 2.94 | 0.93 |
| 2007 | 2.32 | 3.74 | 1.11 |
| 2006 | 1.08 | 1.24 | 0.95 |
| 2005 | 0.78 | 1.07 | 0.56 |
| 2004 | 1.19 | 1.55 | 0.9 |
| 2003 | 1.62 | 2.08 | 1.15 |
| 2002 | 2.6 | 3.33 | 2.22 |
| 2001 | 4.06 | 4.89 | 2.84 |
| 2000 | 4.94 | 7.98 | 3.92 |
| 1999 | 3.73 | 4.9 | 2.64 |
| 1998 | 3.38 | 4.34 | 2.68 |