-79.09% is the change from 813 to 170
Calculation steps:
[( 170 - 813 ) ÷ 813] x 100 = -79.09%
Formula
Percentage change = [(170 - 813) / 813] x 100
Subtract the new number by the original number
170 - 813 = -643
-643 ÷ 813 = -0.7908979089790897
-0.7908979089790897 x 100 = -79.09%