-79.68% is the change from 630 to 128
Calculation steps:
[( 128 - 630 ) ÷ 630] x 100 = -79.68%
Formula
Percentage change = [(128 - 630) / 630] x 100
Subtract the new number by the original number
128 - 630 = -502
-502 ÷ 630 = -0.7968253968253968
-0.7968253968253968 x 100 = -79.68%