-34.23% is the change from 666 to 438
Calculation steps:
[( 438 - 666 ) ÷ 666] x 100 = -34.23%
Formula
Percentage change = [(438 - 666) / 666] x 100
Subtract the new number by the original number
438 - 666 = -228
-228 ÷ 666 = -0.34234234234234234
-0.34234234234234234 x 100 = -34.23%