-32.05% is the change from 312 to 212
Calculation steps:
[( 212 - 312 ) ÷ 312] x 100 = -32.05%
Formula
Percentage change = [(212 - 312) / 312] x 100
Subtract the new number by the original number
212 - 312 = -100
-100 ÷ 312 = -0.32051282051282054
-0.32051282051282054 x 100 = -32.05%