-75.58% is the change from 815 to 199
Calculation steps:
[( 199 - 815 ) ÷ 815] x 100 = -75.58%
Formula
Percentage change = [(199 - 815) / 815] x 100
Subtract the new number by the original number
199 - 815 = -616
-616 ÷ 815 = -0.7558282208588957
-0.7558282208588957 x 100 = -75.58%