-50% is the change from 436 to 218
Calculation steps:
[( 218 - 436 ) ÷ 436] x 100 = -50%
Formula
Percentage change = [(218 - 436) / 436] x 100
Subtract the new number by the original number
218 - 436 = -218
-218 ÷ 436 = -0.5
-0.5 x 100 = -50%
Example