| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 1.41 | 2.06 | 1.25 |
| 2024 | 1.23 | 1.78 | 0.92 |
| 2023 | 1.54 | 1.73 | 1.31 |
| 2022 | 1.62 | 2.04 | 1.38 |
| 2021 | 1.41 | 1.58 | 1.27 |
| 2020 | 1.81 | 2.86 | 1.52 |
| 2019 | 2.16 | 2.8 | 1.68 |
| 2018 | 1.87 | 3.4 | 1.15 |
| 2017 | 3.21 | 4.03 | 2.7 |
| 2016 | 3.56 | 5.03 | 2.73 |
| 2015 | 4.52 | 8.14 | 3.24 |
| 2014 | 3 | 4.65 | 2.15 |
| 2013 | 2.91 | 3.54 | 2.42 |
| 2012 | 2.9 | 3.43 | 2.38 |
| 2011 | 4.67 | 6.46 | 2.61 |
| 2010 | 4.42 | 5.34 | 3.5 |
| 2009 | 2.94 | 5.13 | 1.63 |
| 2008 | 2.34 | 3.96 | 1.19 |
| 2007 | 2.93 | 4.89 | 1.3 |
| 2006 | 1.31 | 2.04 | 0.99 |
| 2005 | 1.02 | 1.17 | 0.79 |
| 2004 | 1.48 | 1.98 | 1.11 |
| 2003 | 2.08 | 2.56 | 1.54 |
| 2002 | 5.66 | 10.35 | 2.69 |