-18.63% is the change from 102 to 83
Calculation steps:
[( 83 - 102 ) ÷ 102] x 100 = -18.63%
Formula
Percentage change = [(83 - 102) / 102] x 100
Subtract the new number by the original number
83 - 102 = -19
-19 ÷ 102 = -0.18627450980392157
-0.18627450980392157 x 100 = -18.63%