| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 1.59 | 1.83 | 1.4 |
| 2024 | 1.53 | 2.1 | 1.07 |
| 2023 | 2.11 | 3.11 | 1.59 |
| 2022 | 2.74 | 3.54 | 2.15 |
| 2021 | 2.46 | 3.86 | 1.82 |
| 2020 | 2.46 | 3.12 | 1.94 |
| 2019 | 3.37 | 4.72 | 2.65 |
| 2018 | 4.33 | 6.1 | 3.28 |
| 2017 | 6.27 | 8.45 | 4.46 |
| 2016 | 3.89 | 11.05 | 1.49 |
| 2015 | 2.28 | 3.51 | 1.55 |
| 2014 | 1.81 | 2.25 | 1.57 |
| 2013 | 1.98 | 2.62 | 1.59 |
| 2012 | 2.53 | 3.21 | 1.88 |
| 2011 | 5.44 | 18.17 | 2.14 |
| 2010 | 7.56 | 9.71 | 5.59 |
| 2009 | 22.57 | 67.51 | 6.81 |
| 2008 | 213.73 | 863.94 | 9.5 |
| 2007 | 11.11 | 17.69 | 5.65 |
| 2006 | 3.14 | 6.06 | 1.97 |
| 2005 | 1.72 | 2.23 | 1.33 |
| 2004 | 2.37 | 3.59 | 1.63 |
| 2003 | 3.24 | 3.86 | 2.74 |
| 2002 | 4.55 | 5.29 | 3.52 |
| 2001 | 6.91 | 10.04 | 4.5 |
| 2000 | 5.23 | 7.53 | 3.23 |