-4.52% is the change from 221 to 211
Calculation steps:
[( 211 - 221 ) ÷ 221] x 100 = -4.52%
Formula
Percentage change = [(211 - 221) / 221] x 100
Subtract the new number by the original number
211 - 221 = -10
-10 ÷ 221 = -0.04524886877828054
-0.04524886877828054 x 100 = -4.52%