-18.01% is the change from 994 to 815
Calculation steps:
[( 815 - 994 ) ÷ 994] x 100 = -18.01%
Formula
Percentage change = [(815 - 994) / 994] x 100
Subtract the new number by the original number
815 - 994 = -179
-179 ÷ 994 = -0.18008048289738432
-0.18008048289738432 x 100 = -18.01%