-57.56% is the change from 172 to 73
Calculation steps:
[( 73 - 172 ) ÷ 172] x 100 = -57.56%
Formula
Percentage change = [(73 - 172) / 172] x 100
Subtract the new number by the original number
73 - 172 = -99
-99 ÷ 172 = -0.5755813953488372
-0.5755813953488372 x 100 = -57.56%