-57.31% is the change from 171 to 73
Calculation steps:
[( 73 - 171 ) ÷ 171] x 100 = -57.31%
Formula
Percentage change = [(73 - 171) / 171] x 100
Subtract the new number by the original number
73 - 171 = -98
-98 ÷ 171 = -0.5730994152046783
-0.5730994152046783 x 100 = -57.31%