-3.51% is the change from 228 to 220
Calculation steps:
[( 220 - 228 ) ÷ 228] x 100 = -3.51%
Formula
Percentage change = [(220 - 228) / 228] x 100
Subtract the new number by the original number
220 - 228 = -8
-8 ÷ 228 = -0.03508771929824561
-0.03508771929824561 x 100 = -3.51%