-81.3% is the change from 663 to 124
Calculation steps:
[( 124 - 663 ) ÷ 663] x 100 = -81.3%
Formula
Percentage change = [(124 - 663) / 663] x 100
Subtract the new number by the original number
124 - 663 = -539
-539 ÷ 663 = -0.8129713423831071
-0.8129713423831071 x 100 = -81.3%