21.41% is the change from 668 to 811
Calculation steps:
[( 811 - 668 ) ÷ 668] x 100 = 21.41%
Formula
Percentage change = [(811 - 668) / 668] x 100
Subtract the new number by the original number
811 - 668 = 143
143 ÷ 668 = 0.21407185628742514
0.21407185628742514 x 100 = 21.41%