-6.11% is the change from 655 to 615
Calculation steps:
[( 615 - 655 ) ÷ 655] x 100 = -6.11%
Formula
Percentage change = [(615 - 655) / 655] x 100
Subtract the new number by the original number
615 - 655 = -40
-40 ÷ 655 = -0.061068702290076333
-0.061068702290076333 x 100 = -6.11%