-52.21% is the change from 816 to 390
Calculation steps:
[( 390 - 816 ) ÷ 816] x 100 = -52.21%
Formula
Percentage change = [(390 - 816) / 816] x 100
Subtract the new number by the original number
390 - 816 = -426
-426 ÷ 816 = -0.5220588235294118
-0.5220588235294118 x 100 = -52.21%