-7.38% is the change from 664 to 615
Calculation steps:
[( 615 - 664 ) ÷ 664] x 100 = -7.38%
Formula
Percentage change = [(615 - 664) / 664] x 100
Subtract the new number by the original number
615 - 664 = -49
-49 ÷ 664 = -0.07379518072289157
-0.07379518072289157 x 100 = -7.38%