-82.68% is the change from 993 to 172
Calculation steps:
[( 172 - 993 ) ÷ 993] x 100 = -82.68%
Formula
Percentage change = [(172 - 993) / 993] x 100
Subtract the new number by the original number
172 - 993 = -821
-821 ÷ 993 = -0.8267875125881168
-0.8267875125881168 x 100 = -82.68%