| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 9.94 | 19.26 | 7.16 |
| 2024 | 5.64 | 10.54 | 2.86 |
| 2023 | 3.22 | 4.32 | 2.44 |
| 2022 | 2.72 | 3.28 | 2.23 |
| 2021 | 3.29 | 4.31 | 2.29 |
| 2020 | 2.13 | 3.09 | 1.66 |
| 2019 | 2.11 | 3.17 | 1.38 |
| 2018 | 2.53 | 3.26 | 1.51 |
| 2017 | 3.68 | 4.35 | 2.73 |
| 2016 | 6.67 | 12.61 | 4.17 |
| 2015 | 8.13 | 14.7 | 4.96 |
| 2014 | 6.25 | 7.36 | 5.24 |
| 2013 | 7.7 | 9.94 | 5.75 |
| 2012 | 9.21 | 14.72 | 6.58 |
| 2011 | 11.03 | 15.13 | 7.51 |
| 2010 | 11.06 | 16.37 | 8.48 |
| 2009 | 19.82 | 45.09 | 7.03 |
| 2008 | 28.24 | 45.78 | 11.5 |
| 2007 | 34.24 | 60.54 | 16.12 |
| 2006 | 18.36 | 32.16 | 9.01 |
| 2005 | 1.46 | 3.91 | 0.59 |
| 2004 | 2.07 | 3.58 | 1.26 |
| 2003 | 3.44 | 4.74 | 2.54 |
| 2002 | 5.36 | 6.14 | 4.5 |
| 2001 | 6.02 | 8.07 | 4.65 |
| 2000 | 4.5 | 5.82 | 3.38 |
| 1999 | 3.67 | 5.24 | 2.47 |
| 1998 | 2.97 | 3.79 | 2.39 |
| 1997 | 3.26 | 4.15 | 2.37 |