-57.06% is the change from 170 to 73
Calculation steps:
[( 73 - 170 ) ÷ 170] x 100 = -57.06%
Formula
Percentage change = [(73 - 170) / 170] x 100
Subtract the new number by the original number
73 - 170 = -97
-97 ÷ 170 = -0.5705882352941176
-0.5705882352941176 x 100 = -57.06%