-22.17% is the change from 221 to 172
Calculation steps:
[( 172 - 221 ) ÷ 221] x 100 = -22.17%
Formula
Percentage change = [(172 - 221) / 221] x 100
Subtract the new number by the original number
172 - 221 = -49
-49 ÷ 221 = -0.22171945701357465
-0.22171945701357465 x 100 = -22.17%