-33.87% is the change from 930 to 615
Calculation steps:
[( 615 - 930 ) ÷ 930] x 100 = -33.87%
Formula
Percentage change = [(615 - 930) / 930] x 100
Subtract the new number by the original number
615 - 930 = -315
-315 ÷ 930 = -0.3387096774193548
-0.3387096774193548 x 100 = -33.87%