-0.32% is the change from 617 to 615
Calculation steps:
[( 615 - 617 ) ÷ 617] x 100 = -0.32%
Formula
Percentage change = [(615 - 617) / 617] x 100
Subtract the new number by the original number
615 - 617 = -2
-2 ÷ 617 = -0.0032414910858995136
-0.0032414910858995136 x 100 = -0.32%