-30.72% is the change from 612 to 424
Calculation steps:
[( 424 - 612 ) ÷ 612] x 100 = -30.72%
Formula
Percentage change = [(424 - 612) / 612] x 100
Subtract the new number by the original number
424 - 612 = -188
-188 ÷ 612 = -0.30718954248366015
-0.30718954248366015 x 100 = -30.72%