-87.05% is the change from 610 to 79
Calculation steps:
[( 79 - 610 ) ÷ 610] x 100 = -87.05%
Formula
Percentage change = [(79 - 610) / 610] x 100
Subtract the new number by the original number
79 - 610 = -531
-531 ÷ 610 = -0.8704918032786885
-0.8704918032786885 x 100 = -87.05%