-79.75% is the change from 810 to 164
Calculation steps:
[( 164 - 810 ) ÷ 810] x 100 = -79.75%
Formula
Percentage change = [(164 - 810) / 810] x 100
Subtract the new number by the original number
164 - 810 = -646
-646 ÷ 810 = -0.7975308641975308
-0.7975308641975308 x 100 = -79.75%