2.85% is the change from 666 to 685
Calculation steps:
[( 685 - 666 ) ÷ 666] x 100 = 2.85%
Formula
Percentage change = [(685 - 666) / 666] x 100
Subtract the new number by the original number
685 - 666 = 19
19 ÷ 666 = 0.028528528528528527
0.028528528528528527 x 100 = 2.85%