| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 1.68 | 2.05 | 1.42 |
| 2024 | 1.76 | 2.1 | 1.23 |
| 2023 | 1.5 | 1.74 | 1.34 |
| 2022 | 1.9 | 2.5 | 1.55 |
| 2021 | 2.39 | 3.01 | 2.07 |
| 2020 | 2.46 | 3.31 | 1.9 |
| 2019 | 2.2 | 3 | 1.96 |
| 2018 | 2.5 | 2.94 | 2.16 |
| 2017 | 2.74 | 3.4 | 2.11 |
| 2016 | 3.61 | 4.9 | 3.08 |
| 2015 | 21.58 | 75.93 | 0.97 |
| 2014 | 10.24 | 41.32 | 1.83 |
| 2013 | 1.66 | 2.39 | 1.29 |
| 2012 | 1.26 | 1.62 | 0.83 |
| 2011 | 2.17 | 2.76 | 1.27 |
| 2010 | 2.2 | 2.79 | 1.41 |
| 2009 | 2.27 | 3.21 | 1.24 |
| 2008 | 3.65 | 8.36 | 0.96 |
| 2007 | 10.74 | 19.34 | 5.43 |
| 2006 | 4.19 | 5.86 | 3.1 |
| 2005 | 2.42 | 3.29 | 1.73 |
| 2004 | 2.21 | 2.92 | 1.72 |
| 2003 | 2.68 | 3.61 | 1.91 |
| 2002 | 4.48 | 5.46 | 3.69 |
| 2001 | 5.93 | 7.44 | 4.07 |