-48.48% is the change from 66 to 34
Calculation steps:
[( 34 - 66 ) ÷ 66] x 100 = -48.48%
Formula
Percentage change = [(34 - 66) / 66] x 100
Subtract the new number by the original number
34 - 66 = -32
-32 ÷ 66 = -0.48484848484848486
-0.48484848484848486 x 100 = -48.48%