-51.6% is the change from 312 to 151
Calculation steps:
[( 151 - 312 ) ÷ 312] x 100 = -51.6%
Formula
Percentage change = [(151 - 312) / 312] x 100
Subtract the new number by the original number
151 - 312 = -161
-161 ÷ 312 = -0.5160256410256411
-0.5160256410256411 x 100 = -51.6%