7.7% is the change from 857 to 923
Calculation steps:
[( 923 - 857 ) ÷ 857] x 100 = 7.7%
Formula
Percentage change = [(923 - 857) / 857] x 100
Subtract the new number by the original number
923 - 857 = 66
66 ÷ 857 = 0.07701283547257877
0.07701283547257877 x 100 = 7.7%