-75.46% is the change from 815 to 200
Calculation steps:
[( 200 - 815 ) ÷ 815] x 100 = -75.46%
Formula
Percentage change = [(200 - 815) / 815] x 100
Subtract the new number by the original number
200 - 815 = -615
-615 ÷ 815 = -0.754601226993865
-0.754601226993865 x 100 = -75.46%