-32.7% is the change from 315 to 212
Calculation steps:
[( 212 - 315 ) ÷ 315] x 100 = -32.7%
Formula
Percentage change = [(212 - 315) / 315] x 100
Subtract the new number by the original number
212 - 315 = -103
-103 ÷ 315 = -0.326984126984127
-0.326984126984127 x 100 = -32.7%