-20.2% is the change from 198 to 158
Calculation steps:
[( 158 - 198 ) ÷ 198] x 100 = -20.2%
Formula
Percentage change = [(158 - 198) / 198] x 100
Subtract the new number by the original number
158 - 198 = -40
-40 ÷ 198 = -0.20202020202020202
-0.20202020202020202 x 100 = -20.2%