-27.21% is the change from 136 to 99
Calculation steps:
[( 99 - 136 ) ÷ 136] x 100 = -27.21%
Formula
Percentage change = [(99 - 136) / 136] x 100
Subtract the new number by the original number
99 - 136 = -37
-37 ÷ 136 = -0.27205882352941174
-0.27205882352941174 x 100 = -27.21%