3.3% is the change from 666 to 688
Calculation steps:
[( 688 - 666 ) ÷ 666] x 100 = 3.3%
Formula
Percentage change = [(688 - 666) / 666] x 100
Subtract the new number by the original number
688 - 666 = 22
22 ÷ 666 = 0.03303303303303303
0.03303303303303303 x 100 = 3.3%