-3.49% is the change from 229 to 221
Calculation steps:
[( 221 - 229 ) ÷ 229] x 100 = -3.49%
Formula
Percentage change = [(221 - 229) / 229] x 100
Subtract the new number by the original number
221 - 229 = -8
-8 ÷ 229 = -0.034934497816593885
-0.034934497816593885 x 100 = -3.49%