-40.06% is the change from 312 to 187
Calculation steps:
[( 187 - 312 ) ÷ 312] x 100 = -40.06%
Formula
Percentage change = [(187 - 312) / 312] x 100
Subtract the new number by the original number
187 - 312 = -125
-125 ÷ 312 = -0.40064102564102566
-0.40064102564102566 x 100 = -40.06%