| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2026 | 3.72 | 4.49 | 3.34 |
| 2025 | 3.05 | 4.48 | 2.52 |
| 2024 | 2.77 | 3.78 | 2.21 |
| 2023 | 3.35 | 4.05 | 2.9 |
| 2022 | 3.61 | 5.5 | 2.54 |
| 2021 | 3.3 | 4.56 | 2.24 |
| 2020 | 1.07 | 4.65 | 0.64 |
| 2019 | 0.91 | 1.18 | 0.77 |
| 2018 | 1.24 | 1.98 | 0.81 |
| 2017 | 1.76 | 2.32 | 1.44 |
| 2016 | 1.51 | 1.94 | 1.2 |
| 2015 | 1.74 | 2.84 | 1.21 |
| 2014 | 1.29 | 1.65 | 1.04 |
| 2013 | 2.01 | 3.75 | 1.28 |
| 2012 | 2.68 | 3.63 | 1.92 |
| 2011 | 3.71 | 4.86 | 3.13 |
| 2010 | 4.09 | 5.21 | 2.91 |
| 2009 | 3.33 | 5.43 | 1.63 |
| 2008 | 3.95 | 7.34 | 1.26 |
| 2007 | 4.84 | 8.19 | 1.93 |
| 2006 | 1.81 | 2.44 | 1.12 |
| 2005 | 1.92 | 2.79 | 1.11 |
| 2004 | 3.58 | 5.1 | 2.75 |
| 2003 | 4.15 | 5.09 | 3.02 |
| 2002 | 6.22 | 7.62 | 4.7 |
| 2001 | 10.27 | 16.38 | 6.52 |
| 2000 | 14.37 | 18.35 | 7.79 |
| 1999 | 5.74 | 10.67 | 2.97 |