| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 39.61 | 53.24 | 29.93 |
| 2024 | 36.5 | 63.97 | 25.99 |
| 2023 | 69.22 | 74.64 | 59.34 |
| 2022 | 32.69 | 74.25 | 15.85 |
| 2021 | 14.2 | 18.95 | 7.79 |
| 2020 | 15.48 | 26.26 | 7.36 |
| 2019 | 26.68 | 36.39 | 20.12 |
| 2018 | 27.46 | 45.58 | 19.41 |
| 2017 | 62.52 | 71.68 | 41.24 |
| 2016 | 68.03 | 84.75 | 45.51 |
| 2015 | 38.04 | 51.84 | 22.42 |
| 2014 | 22.2 | 26.98 | 17.57 |
| 2013 | 16.86 | 24.67 | 7.08 |
| 2012 | 7.57 | 9.06 | 6.31 |
| 2011 | 8.88 | 9.87 | 6.75 |
| 2010 | 8.67 | 10.69 | 7.14 |
| 2009 | 5.07 | 7.93 | 2.7 |
| 2008 | 4.02 | 7.77 | 1.74 |
| 2007 | 5.52 | 7.7 | 3.3 |
| 2006 | 2.87 | 3.83 | 2.04 |
| 2005 | 2.16 | 2.82 | 1.59 |
| 2004 | 2.92 | 3.99 | 2.3 |
| 2003 | 4.38 | 5.7 | 2.9 |
| 2002 | 5.72 | 6.65 | 4.13 |
| 2001 | 8.05 | 10.36 | 5.62 |
| 2000 | 8.06 | 9.76 | 5.93 |
| 1999 | 5.76 | 7.8 | 4.01 |
| 1998 | 5.62 | 7.43 | 3.93 |
| 1997 | 4.02 | 5.73 | 3.12 |