-10.37% is the change from 135 to 121
Calculation steps:
[( 121 - 135 ) ÷ 135] x 100 = -10.37%
Formula
Percentage change = [(121 - 135) / 135] x 100
Subtract the new number by the original number
121 - 135 = -14
-14 ÷ 135 = -0.1037037037037037
-0.1037037037037037 x 100 = -10.37%