-52.57% is the change from 816 to 387
Calculation steps:
[( 387 - 816 ) ÷ 816] x 100 = -52.57%
Formula
Percentage change = [(387 - 816) / 816] x 100
Subtract the new number by the original number
387 - 816 = -429
-429 ÷ 816 = -0.5257352941176471
-0.5257352941176471 x 100 = -52.57%