-45.51% is the change from 312 to 170
Calculation steps:
[( 170 - 312 ) ÷ 312] x 100 = -45.51%
Formula
Percentage change = [(170 - 312) / 312] x 100
Subtract the new number by the original number
170 - 312 = -142
-142 ÷ 312 = -0.4551282051282051
-0.4551282051282051 x 100 = -45.51%