-3.64% is the change from 220 to 212
Calculation steps:
[( 212 - 220 ) ÷ 220] x 100 = -3.64%
Formula
Percentage change = [(212 - 220) / 220] x 100
Subtract the new number by the original number
212 - 220 = -8
-8 ÷ 220 = -0.03636363636363636
-0.03636363636363636 x 100 = -3.64%