-80.4% is the change from 199 to 39
Calculation steps:
[( 39 - 199 ) ÷ 199] x 100 = -80.4%
Formula
Percentage change = [(39 - 199) / 199] x 100
Subtract the new number by the original number
39 - 199 = -160
-160 ÷ 199 = -0.8040201005025126
-0.8040201005025126 x 100 = -80.4%