-87.5% is the change from 136 to 17
Calculation steps:
[( 17 - 136 ) ÷ 136] x 100 = -87.5%
Formula
Percentage change = [(17 - 136) / 136] x 100
Subtract the new number by the original number
17 - 136 = -119
-119 ÷ 136 = -0.875
-0.875 x 100 = -87.5%
Example