-50.57% is the change from 435 to 215
Calculation steps:
[( 215 - 435 ) ÷ 435] x 100 = -50.57%
Formula
Percentage change = [(215 - 435) / 435] x 100
Subtract the new number by the original number
215 - 435 = -220
-220 ÷ 435 = -0.5057471264367817
-0.5057471264367817 x 100 = -50.57%