-39.22% is the change from 306 to 186
Calculation steps:
[( 186 - 306 ) ÷ 306] x 100 = -39.22%
Formula
Percentage change = [(186 - 306) / 306] x 100
Subtract the new number by the original number
186 - 306 = -120
-120 ÷ 306 = -0.39215686274509803
-0.39215686274509803 x 100 = -39.22%