-51.9% is the change from 817 to 393
Calculation steps:
[( 393 - 817 ) ÷ 817] x 100 = -51.9%
Formula
Percentage change = [(393 - 817) / 817] x 100
Subtract the new number by the original number
393 - 817 = -424
-424 ÷ 817 = -0.5189718482252142
-0.5189718482252142 x 100 = -51.9%