| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 2.29 | 2.56 | 2.04 |
| 2024 | 1.78 | 3.05 | 0.92 |
| 2023 | 1.45 | 1.98 | 0.97 |
| 2022 | 1.17 | 1.48 | 0.94 |
| 2021 | 1.51 | 1.88 | 1.29 |
| 2020 | 1.9 | 2.81 | 1.52 |
| 2019 | 2.05 | 2.67 | 1.69 |
| 2018 | 2.43 | 3.44 | 1.74 |
| 2017 | 3.35 | 4.69 | 2.41 |
| 2016 | 3.05 | 5.42 | 2.3 |
| 2015 | 6.07 | 10.16 | 3.98 |
| 2014 | 3.43 | 4.62 | 2.82 |
| 2013 | 3.52 | 4.46 | 2.97 |
| 2012 | 4.54 | 5.87 | 3.16 |
| 2011 | 7.14 | 10 | 3.98 |
| 2010 | 7.17 | 11.45 | 4.67 |
| 2009 | 4.78 | 7.65 | 2.07 |
| 2008 | 3.05 | 5.68 | 1.33 |
| 2007 | 5.88 | 12.67 | 3.28 |
| 2006 | 2.26 | 3.82 | 1.32 |
| 2005 | 1.51 | 2.15 | 1.11 |
| 2004 | 2.25 | 3.28 | 1.58 |
| 2003 | 3.15 | 3.88 | 2.24 |
| 2002 | 6.24 | 6.55 | 6.03 |