-73.97% is the change from 657 to 171
Calculation steps:
[( 171 - 657 ) ÷ 657] x 100 = -73.97%
Formula
Percentage change = [(171 - 657) / 657] x 100
Subtract the new number by the original number
171 - 657 = -486
-486 ÷ 657 = -0.7397260273972602
-0.7397260273972602 x 100 = -73.97%