-50.64% is the change from 312 to 154
Calculation steps:
[( 154 - 312 ) ÷ 312] x 100 = -50.64%
Formula
Percentage change = [(154 - 312) / 312] x 100
Subtract the new number by the original number
154 - 312 = -158
-158 ÷ 312 = -0.5064102564102564
-0.5064102564102564 x 100 = -50.64%