-52.17% is the change from 391 to 187
Calculation steps:
[( 187 - 391 ) ÷ 391] x 100 = -52.17%
Formula
Percentage change = [(187 - 391) / 391] x 100
Subtract the new number by the original number
187 - 391 = -204
-204 ÷ 391 = -0.5217391304347826
-0.5217391304347826 x 100 = -52.17%