-51.84% is the change from 816 to 393
Calculation steps:
[( 393 - 816 ) ÷ 816] x 100 = -51.84%
Formula
Percentage change = [(393 - 816) / 816] x 100
Subtract the new number by the original number
393 - 816 = -423
-423 ÷ 816 = -0.5183823529411765
-0.5183823529411765 x 100 = -51.84%