21.23% is the change from 669 to 811
Calculation steps:
[( 811 - 669 ) ÷ 669] x 100 = 21.23%
Formula
Percentage change = [(811 - 669) / 669] x 100
Subtract the new number by the original number
811 - 669 = 142
142 ÷ 669 = 0.21225710014947682
0.21225710014947682 x 100 = 21.23%