| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 2.02 | 2.3 | 1.75 |
| 2024 | 1.74 | 2.19 | 1.42 |
| 2023 | 2.03 | 2.56 | 1.58 |
| 2022 | 2.1 | 3.78 | 1.47 |
| 2021 | 2.94 | 5.07 | 1.8 |
| 2020 | 1.62 | 2.62 | 1.09 |
| 2019 | 1.42 | 1.95 | 0.93 |
| 2018 | 1.68 | 2.97 | 1.03 |
| 2017 | 2.85 | 4.49 | 1.76 |
| 2016 | 2.45 | 3.77 | 1.78 |
| 2015 | 3.09 | 6.22 | 1.32 |
| 2014 | 1.71 | 2.57 | 1.25 |
| 2013 | 1.78 | 2.36 | 1.38 |
| 2012 | 2.17 | 2.69 | 1.78 |
| 2011 | 3.22 | 4.23 | 1.85 |
| 2010 | 3.28 | 4.57 | 2.18 |
| 2009 | 3.76 | 6.9 | 1.65 |
| 2008 | 4.26 | 11.94 | 1.33 |
| 2007 | 8.49 | 16.54 | 3.26 |
| 2006 | 2.19 | 3.5 | 1.22 |
| 2005 | 1.16 | 1.47 | 0.82 |
| 2004 | 1.82 | 2.61 | 1.31 |
| 2003 | 2.02 | 2.35 | 1.7 |
| 2002 | 4.39 | 5.01 | 3.71 |
| 2001 | 4.43 | 5.36 | 3.46 |
| 2000 | 3.64 | 4.49 | 2.53 |
| 1999 | 2.72 | 3.38 | 2.1 |