-29.09% is the change from 220 to 156
Calculation steps:
[( 156 - 220 ) ÷ 220] x 100 = -29.09%
Formula
Percentage change = [(156 - 220) / 220] x 100
Subtract the new number by the original number
156 - 220 = -64
-64 ÷ 220 = -0.2909090909090909
-0.2909090909090909 x 100 = -29.09%