-51.11% is the change from 135 to 66
Calculation steps:
[( 66 - 135 ) ÷ 135] x 100 = -51.11%
Formula
Percentage change = [(66 - 135) / 135] x 100
Subtract the new number by the original number
66 - 135 = -69
-69 ÷ 135 = -0.5111111111111111
-0.5111111111111111 x 100 = -51.11%