-10.48% is the change from 687 to 615
Calculation steps:
[( 615 - 687 ) ÷ 687] x 100 = -10.48%
Formula
Percentage change = [(615 - 687) / 687] x 100
Subtract the new number by the original number
615 - 687 = -72
-72 ÷ 687 = -0.10480349344978165
-0.10480349344978165 x 100 = -10.48%