-79.38% is the change from 805 to 166
Calculation steps:
[( 166 - 805 ) ÷ 805] x 100 = -79.38%
Formula
Percentage change = [(166 - 805) / 805] x 100
Subtract the new number by the original number
166 - 805 = -639
-639 ÷ 805 = -0.7937888198757764
-0.7937888198757764 x 100 = -79.38%