-49.36% is the change from 312 to 158
Calculation steps:
[( 158 - 312 ) ÷ 312] x 100 = -49.36%
Formula
Percentage change = [(158 - 312) / 312] x 100
Subtract the new number by the original number
158 - 312 = -154
-154 ÷ 312 = -0.4935897435897436
-0.4935897435897436 x 100 = -49.36%