-84.6% is the change from 513 to 79
Calculation steps:
[( 79 - 513 ) ÷ 513] x 100 = -84.6%
Formula
Percentage change = [(79 - 513) / 513] x 100
Subtract the new number by the original number
79 - 513 = -434
-434 ÷ 513 = -0.8460038986354775
-0.8460038986354775 x 100 = -84.6%