-78.26% is the change from 621 to 135
Calculation steps:
[( 135 - 621 ) ÷ 621] x 100 = -78.26%
Formula
Percentage change = [(135 - 621) / 621] x 100
Subtract the new number by the original number
135 - 621 = -486
-486 ÷ 621 = -0.782608695652174
-0.782608695652174 x 100 = -78.26%