-31.17% is the change from 308 to 212
Calculation steps:
[( 212 - 308 ) ÷ 308] x 100 = -31.17%
Formula
Percentage change = [(212 - 308) / 308] x 100
Subtract the new number by the original number
212 - 308 = -96
-96 ÷ 308 = -0.3116883116883117
-0.3116883116883117 x 100 = -31.17%