-22.02% is the change from 218 to 170
Calculation steps:
[( 170 - 218 ) ÷ 218] x 100 = -22.02%
Formula
Percentage change = [(170 - 218) / 218] x 100
Subtract the new number by the original number
170 - 218 = -48
-48 ÷ 218 = -0.22018348623853212
-0.22018348623853212 x 100 = -22.02%