-39.07% is the change from 215 to 131
Calculation steps:
[( 131 - 215 ) ÷ 215] x 100 = -39.07%
Formula
Percentage change = [(131 - 215) / 215] x 100
Subtract the new number by the original number
131 - 215 = -84
-84 ÷ 215 = -0.39069767441860465
-0.39069767441860465 x 100 = -39.07%