-21.92% is the change from 219 to 171
Calculation steps:
[( 171 - 219 ) ÷ 219] x 100 = -21.92%
Formula
Percentage change = [(171 - 219) / 219] x 100
Subtract the new number by the original number
171 - 219 = -48
-48 ÷ 219 = -0.2191780821917808
-0.2191780821917808 x 100 = -21.92%