-24.72% is the change from 817 to 615
Calculation steps:
[( 615 - 817 ) ÷ 817] x 100 = -24.72%
Formula
Percentage change = [(615 - 817) / 817] x 100
Subtract the new number by the original number
615 - 817 = -202
-202 ÷ 817 = -0.24724602203182375
-0.24724602203182375 x 100 = -24.72%