| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 6.73 | 8.92 | 3.95 |
| 2024 | 6.56 | 11.63 | 3.36 |
| 2023 | 15.26 | 19.66 | 8.8 |
| 2022 | 18.51 | 23.93 | 15.76 |
| 2021 | 22.36 | 40.44 | 14.27 |
| 2020 | 12.92 | 18.45 | 9.93 |
| 2019 | 10.32 | 18.19 | 5.77 |
| 2018 | 8.82 | 47.41 | 3.76 |
| 2017 | 39.11 | 67.52 | 6.82 |
| 2016 | 9.71 | 12.21 | 7.1 |
| 2015 | 7.64 | 13.64 | 4.69 |
| 2014 | 4.96 | 6.54 | 3.83 |
| 2013 | 3.99 | 4.93 | 3.16 |
| 2012 | 4.99 | 7.28 | 3.67 |
| 2011 | 6.08 | 10.48 | 3.99 |
| 2010 | 4.51 | 5.53 | 3.58 |
| 2009 | 4.09 | 5.72 | 2.04 |
| 2008 | 3.46 | 6.11 | 1.67 |
| 2007 | 4.83 | 7.27 | 2.03 |
| 2006 | 2.01 | 2.51 | 1.62 |
| 2005 | 1.82 | 2.5 | 1.38 |
| 2004 | 3.48 | 5.15 | 2.38 |
| 2003 | 5.42 | 6.79 | 3.9 |
| 2002 | 6.23 | 7.48 | 4.19 |
| 2001 | 7.35 | 9.17 | 5.46 |
| 2000 | 7.17 | 10.08 | 4.31 |
| 1999 | 3.13 | 4.01 | 2.26 |
| 1998 | 2.75 | 3.35 | 2.22 |
| 1997 | 2.86 | 4.28 | 2.15 |