-64.91% is the change from 815 to 286
Calculation steps:
[( 286 - 815 ) ÷ 815] x 100 = -64.91%
Formula
Percentage change = [(286 - 815) / 815] x 100
Subtract the new number by the original number
286 - 815 = -529
-529 ÷ 815 = -0.649079754601227
-0.649079754601227 x 100 = -64.91%