| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 3.18 | 3.57 | 2.66 |
| 2024 | 3.66 | 4.75 | 2.62 |
| 2023 | 6.42 | 7.67 | 4.59 |
| 2022 | 6 | 7.7 | 3.12 |
| 2021 | 3.64 | 4.98 | 2.87 |
| 2020 | 1.69 | 5.26 | 1.1 |
| 2019 | 1.61 | 2.38 | 1.13 |
| 2018 | 1.52 | 2.03 | 1.08 |
| 2017 | 2.18 | 2.64 | 1.84 |
| 2016 | 2.32 | 3.25 | 1.71 |
| 2015 | 2.7 | 4.01 | 1.88 |
| 2014 | 2.17 | 3.11 | 1.71 |
| 2013 | 3.58 | 6.16 | 2.24 |
| 2012 | 6.12 | 7.63 | 4 |
| 2011 | 8.56 | 15 | 4.88 |
| 2010 | 9.58 | 15.08 | 6.11 |
| 2009 | 3.48 | 7.3 | 1.82 |
| 2008 | 2.86 | 5.42 | 1.24 |
| 2007 | 3.92 | 5.58 | 1.96 |
| 2006 | 1.35 | 2 | 0.9 |
| 2005 | 1 | 1.22 | 0.74 |
| 2004 | 1.67 | 2.21 | 1.32 |
| 2003 | 1.78 | 2.24 | 1.39 |
| 2002 | 2.97 | 4.09 | 2.38 |
| 2001 | 5.06 | 5.94 | 3.73 |
| 2000 | 5.69 | 8.01 | 3.4 |
| 1999 | 3.62 | 4.67 | 2.85 |