31.55% is the change from 168 to 221
Calculation steps:
[( 221 - 168 ) ÷ 168] x 100 = 31.55%
Formula
Percentage change = [(221 - 168) / 168] x 100
Subtract the new number by the original number
221 - 168 = 53
53 ÷ 168 = 0.31547619047619047
0.31547619047619047 x 100 = 31.55%