-18.63% is the change from 204 to 166
Calculation steps:
[( 166 - 204 ) ÷ 204] x 100 = -18.63%
Formula
Percentage change = [(166 - 204) / 204] x 100
Subtract the new number by the original number
166 - 204 = -38
-38 ÷ 204 = -0.18627450980392157
-0.18627450980392157 x 100 = -18.63%