-66.82% is the change from 220 to 73
Calculation steps:
[( 73 - 220 ) ÷ 220] x 100 = -66.82%
Formula
Percentage change = [(73 - 220) / 220] x 100
Subtract the new number by the original number
73 - 220 = -147
-147 ÷ 220 = -0.6681818181818182
-0.6681818181818182 x 100 = -66.82%