-15.81% is the change from 993 to 836
Calculation steps:
[( 836 - 993 ) ÷ 993] x 100 = -15.81%
Formula
Percentage change = [(836 - 993) / 993] x 100
Subtract the new number by the original number
836 - 993 = -157
-157 ÷ 993 = -0.1581067472306143
-0.1581067472306143 x 100 = -15.81%