Barely Significant

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In the second stage, the average efficiency value also presents an inverted “V” shaped trend, during 2011–2013, the average efficiency value shows an increasing trend, rising from 0.29 in 2011 to 0.43 in 2013, however, in just one year, the average efficiency value decreases from 0.43 in 2013 to 0.31 in 2014.