| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 6.32 | 7.48 | 5.03 |
| 2024 | 2.6 | 8.25 | 1.26 |
| 2023 | 2.19 | 2.66 | 1.86 |
| 2022 | 1.87 | 2.53 | 1.53 |
| 2021 | 1.52 | 2.29 | 0.76 |
| 2020 | 1.3 | 1.94 | 1.02 |
| 2019 | 1.16 | 1.68 | 0.54 |
| 2018 | 1.26 | 2.05 | 0.53 |
| 2017 | 2.23 | 2.54 | 2.02 |
| 2016 | 2.35 | 3.35 | 1.97 |
| 2015 | 4.56 | 6.72 | 2.39 |
| 2014 | 5.66 | 9.78 | 4.31 |
| 2013 | 5.41 | 8.15 | 3 |
| 2012 | 3.12 | 3.42 | 2.79 |
| 2011 | 3.25 | 3.98 | 2.8 |
| 2010 | 3.8 | 4.92 | 2.95 |
| 2009 | 3.37 | 4.62 | 2.08 |
| 2008 | 3.95 | 7.48 | 1.73 |
| 2007 | 7.21 | 10.48 | 5.11 |
| 2006 | 3.47 | 6.18 | 1.8 |
| 2005 | 2.41 | 5.51 | 2.13 |
| 2004 | 3.13 | 6.58 | 2.22 |
| 2003 | 4.99 | 5.99 | 3.96 |
| 2002 | 4.01 | 4.68 | 2.92 |
| 2001 | 3.96 | 4.65 | 2.97 |
| 2000 | 7.43 | 13.53 | 4.21 |
| 1999 | 5.52 | 9.93 | 2.49 |
| 1998 | 3.63 | 4.37 | 1.82 |