-51.66% is the change from 813 to 393
Calculation steps:
[( 393 - 813 ) ÷ 813] x 100 = -51.66%
Formula
Percentage change = [(393 - 813) / 813] x 100
Subtract the new number by the original number
393 - 813 = -420
-420 ÷ 813 = -0.5166051660516605
-0.5166051660516605 x 100 = -51.66%