-68.4% is the change from 231 to 73
Calculation steps:
[( 73 - 231 ) ÷ 231] x 100 = -68.4%
Formula
Percentage change = [(73 - 231) / 231] x 100
Subtract the new number by the original number
73 - 231 = -158
-158 ÷ 231 = -0.683982683982684
-0.683982683982684 x 100 = -68.4%