-19.5% is the change from 159 to 128
Calculation steps:
[( 128 - 159 ) ÷ 159] x 100 = -19.5%
Formula
Percentage change = [(128 - 159) / 159] x 100
Subtract the new number by the original number
128 - 159 = -31
-31 ÷ 159 = -0.1949685534591195
-0.1949685534591195 x 100 = -19.5%