| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 9.35 | 11.6 | 6.21 |
| 2024 | 9.02 | 18.4 | 3.8 |
| 2023 | 5.02 | 8.57 | 1.39 |
| 2022 | 1.65 | 2.52 | 1.16 |
| 2021 | 2.09 | 2.93 | 1.7 |
| 2020 | 18.31 | 74.42 | 2.42 |
| 2019 | 14.38 | 19.82 | 9.91 |
| 2018 | 12.96 | 17.32 | 9.88 |
| 2017 | 23.08 | 39.01 | 14.79 |
| 2016 | 36.99 | 41.93 | 26.5 |
| 2015 | 32.57 | 51.36 | 18.6 |
| 2014 | 17.59 | 28.39 | 12.12 |
| 2013 | 11.96 | 14.9 | 9.1 |
| 2012 | 9.68 | 12.27 | 7.8 |
| 2011 | 14.23 | 17.85 | 9.17 |
| 2010 | 14.29 | 17.59 | 11.31 |
| 2009 | 9.98 | 14.22 | 4.48 |
| 2008 | 7.19 | 13.05 | 3.27 |
| 2007 | 8.92 | 13.38 | 4.19 |
| 2006 | 4.11 | 5.21 | 3.02 |
| 2005 | 4.32 | 6.03 | 3.08 |
| 2004 | 8.79 | 17.42 | 4.81 |
| 2003 | 11.11 | 20.17 | 7.62 |
| 2002 | 23.74 | 28.35 | 21.01 |
| 2001 | 37.77 | 49.15 | 27.31 |
| 2000 | 59.78 | 86.28 | 26.1 |
| 1999 | 22.44 | 29.96 | 17.62 |
| 1998 | 6.11 | 10.12 | 4.05 |
| 1997 | 6.84 | 9.32 | 5.22 |