-51.72% is the change from 816 to 394
Calculation steps:
[( 394 - 816 ) ÷ 816] x 100 = -51.72%
Formula
Percentage change = [(394 - 816) / 816] x 100
Subtract the new number by the original number
394 - 816 = -422
-422 ÷ 816 = -0.5171568627450981
-0.5171568627450981 x 100 = -51.72%