-87.78% is the change from 630 to 77
Calculation steps:
[( 77 - 630 ) ÷ 630] x 100 = -87.78%
Formula
Percentage change = [(77 - 630) / 630] x 100
Subtract the new number by the original number
77 - 630 = -553
-553 ÷ 630 = -0.8777777777777778
-0.8777777777777778 x 100 = -87.78%