-4.07% is the change from 221 to 212
Calculation steps:
[( 212 - 221 ) ÷ 221] x 100 = -4.07%
Formula
Percentage change = [(212 - 221) / 221] x 100
Subtract the new number by the original number
212 - 221 = -9
-9 ÷ 221 = -0.04072398190045249
-0.04072398190045249 x 100 = -4.07%