23.57% is the change from 666 to 823
Calculation steps:
[( 823 - 666 ) ÷ 666] x 100 = 23.57%
Formula
Percentage change = [(823 - 666) / 666] x 100
Subtract the new number by the original number
823 - 666 = 157
157 ÷ 666 = 0.23573573573573572
0.23573573573573572 x 100 = 23.57%