-24.63% is the change from 816 to 615
Calculation steps:
[( 615 - 816 ) ÷ 816] x 100 = -24.63%
Formula
Percentage change = [(615 - 816) / 816] x 100
Subtract the new number by the original number
615 - 816 = -201
-201 ÷ 816 = -0.24632352941176472
-0.24632352941176472 x 100 = -24.63%