-60.64% is the change from 813 to 320
Calculation steps:
[( 320 - 813 ) ÷ 813] x 100 = -60.64%
Formula
Percentage change = [(320 - 813) / 813] x 100
Subtract the new number by the original number
320 - 813 = -493
-493 ÷ 813 = -0.6063960639606396
-0.6063960639606396 x 100 = -60.64%