-52.52% is the change from 815 to 387
Calculation steps:
[( 387 - 815 ) ÷ 815] x 100 = -52.52%
Formula
Percentage change = [(387 - 815) / 815] x 100
Subtract the new number by the original number
387 - 815 = -428
-428 ÷ 815 = -0.5251533742331288
-0.5251533742331288 x 100 = -52.52%