-10.87% is the change from 690 to 615
Calculation steps:
[( 615 - 690 ) ÷ 690] x 100 = -10.87%
Formula
Percentage change = [(615 - 690) / 690] x 100
Subtract the new number by the original number
615 - 690 = -75
-75 ÷ 690 = -0.10869565217391304
-0.10869565217391304 x 100 = -10.87%