-91.84% is the change from 993 to 81
Calculation steps:
[( 81 - 993 ) ÷ 993] x 100 = -91.84%
Formula
Percentage change = [(81 - 993) / 993] x 100
Subtract the new number by the original number
81 - 993 = -912
-912 ÷ 993 = -0.918429003021148
-0.918429003021148 x 100 = -91.84%