-78.76% is the change from 805 to 171
Calculation steps:
[( 171 - 805 ) ÷ 805] x 100 = -78.76%
Formula
Percentage change = [(171 - 805) / 805] x 100
Subtract the new number by the original number
171 - 805 = -634
-634 ÷ 805 = -0.7875776397515528
-0.7875776397515528 x 100 = -78.76%