-36.74% is the change from 215 to 136
Calculation steps:
[( 136 - 215 ) ÷ 215] x 100 = -36.74%
Formula
Percentage change = [(136 - 215) / 215] x 100
Subtract the new number by the original number
136 - 215 = -79
-79 ÷ 215 = -0.3674418604651163
-0.3674418604651163 x 100 = -36.74%