-13.4% is the change from 642 to 556
Calculation steps:
[( 556 - 642 ) ÷ 642] x 100 = -13.4%
Formula
Percentage change = [(556 - 642) / 642] x 100
Subtract the new number by the original number
556 - 642 = -86
-86 ÷ 642 = -0.13395638629283488
-0.13395638629283488 x 100 = -13.4%