21.77% is the change from 666 to 811
Calculation steps:
[( 811 - 666 ) ÷ 666] x 100 = 21.77%
Formula
Percentage change = [(811 - 666) / 666] x 100
Subtract the new number by the original number
811 - 666 = 145
145 ÷ 666 = 0.21771771771771772
0.21771771771771772 x 100 = 21.77%