-71.48% is the change from 256 to 73
Calculation steps:
[( 73 - 256 ) ÷ 256] x 100 = -71.48%
Formula
Percentage change = [(73 - 256) / 256] x 100
Subtract the new number by the original number
73 - 256 = -183
-183 ÷ 256 = -0.71484375
-0.71484375 x 100 = -71.48%