-15.96% is the change from 188 to 158
Calculation steps:
[( 158 - 188 ) ÷ 188] x 100 = -15.96%
Formula
Percentage change = [(158 - 188) / 188] x 100
Subtract the new number by the original number
158 - 188 = -30
-30 ÷ 188 = -0.1595744680851064
-0.1595744680851064 x 100 = -15.96%