-19.05% is the change from 168 to 136
Calculation steps:
[( 136 - 168 ) ÷ 168] x 100 = -19.05%
Formula
Percentage change = [(136 - 168) / 168] x 100
Subtract the new number by the original number
136 - 168 = -32
-32 ÷ 168 = -0.19047619047619047
-0.19047619047619047 x 100 = -19.05%