-50.37% is the change from 135 to 67
Calculation steps:
[( 67 - 135 ) ÷ 135] x 100 = -50.37%
Formula
Percentage change = [(67 - 135) / 135] x 100
Subtract the new number by the original number
67 - 135 = -68
-68 ÷ 135 = -0.5037037037037037
-0.5037037037037037 x 100 = -50.37%