-75.4% is the change from 630 to 155
Calculation steps:
[( 155 - 630 ) ÷ 630] x 100 = -75.4%
Formula
Percentage change = [(155 - 630) / 630] x 100
Subtract the new number by the original number
155 - 630 = -475
-475 ÷ 630 = -0.753968253968254
-0.753968253968254 x 100 = -75.4%