-60.83% is the change from 817 to 320
Calculation steps:
[( 320 - 817 ) ÷ 817] x 100 = -60.83%
Formula
Percentage change = [(320 - 817) / 817] x 100
Subtract the new number by the original number
320 - 817 = -497
-497 ÷ 817 = -0.6083231334149327
-0.6083231334149327 x 100 = -60.83%