-3.93% is the change from 407 to 391
Calculation steps:
[( 391 - 407 ) ÷ 407] x 100 = -3.93%
Formula
Percentage change = [(391 - 407) / 407] x 100
Subtract the new number by the original number
391 - 407 = -16
-16 ÷ 407 = -0.03931203931203931
-0.03931203931203931 x 100 = -3.93%