-84.39% is the change from 993 to 155
Calculation steps:
[( 155 - 993 ) ÷ 993] x 100 = -84.39%
Formula
Percentage change = [(155 - 993) / 993] x 100
Subtract the new number by the original number
155 - 993 = -838
-838 ÷ 993 = -0.8439073514602216
-0.8439073514602216 x 100 = -84.39%