-79.58% is the change from 813 to 166
Calculation steps:
[( 166 - 813 ) ÷ 813] x 100 = -79.58%
Formula
Percentage change = [(166 - 813) / 813] x 100
Subtract the new number by the original number
166 - 813 = -647
-647 ÷ 813 = -0.7958179581795818
-0.7958179581795818 x 100 = -79.58%