| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 4 | 5.88 | 2.24 |
| 2024 | 2.28 | 3.54 | 1.64 |
| 2023 | 3.03 | 3.31 | 2.66 |
| 2022 | 3.13 | 4.43 | 2.45 |
| 2021 | 3 | 3.5 | 2.61 |
| 2020 | 3.95 | 5.02 | 3.11 |
| 2019 | 4.56 | 8.56 | 2.72 |
| 2018 | 4.38 | 6.58 | 2.75 |
| 2017 | 13.16 | 21.28 | 5.78 |
| 2016 | 21.46 | 25.51 | 17.03 |
| 2015 | 22.52 | 40.28 | 11.24 |
| 2014 | 11.18 | 16.17 | 6.46 |
| 2013 | 5.38 | 7.43 | 3.88 |
| 2012 | 6.42 | 8.71 | 4.65 |
| 2011 | 9.13 | 13.06 | 5.47 |
| 2010 | 7.91 | 13.54 | 4.72 |
| 2009 | 4.54 | 5.65 | 3.07 |
| 2008 | 4.36 | 7.9 | 2.13 |
| 2007 | 6.34 | 10.54 | 2.32 |
| 2006 | 2.53 | 3.28 | 2.02 |
| 2005 | 2.59 | 3.47 | 1.8 |
| 2004 | 3.47 | 4.8 | 2.64 |
| 2003 | 4.12 | 5.79 | 2.87 |
| 2002 | 6.34 | 8.21 | 3.53 |
| 2001 | 10.47 | 16.24 | 5.8 |
| 2000 | 16.5 | 20.52 | 5.15 |
| 1999 | 4.35 | 6.49 | 3.19 |
| 1998 | 4.71 | 7.82 | 3.26 |
| 1997 | 5.49 | 8.5 | 3.63 |