年份 | 2009 | 2010 | 2011 | 2012 | 2013 |
F值 | −1.51103 | −1.08028 | 0.10072 | 0.20342 | −0.23358 |
年份 | 2014 | 2015 | 2016 | 2017 | 2018 |
F值 | 0.76467 | -0.04621 | −0.17912 | 1.36057 | 0.62339 |