2.66% is the change from 639 to 656
Calculation steps:
[( 656 - 639 ) ÷ 639] x 100 = 2.66%
Formula
Percentage change = [(656 - 639) / 639] x 100
Subtract the new number by the original number
656 - 639 = 17
17 ÷ 639 = 0.026604068857589983
0.026604068857589983 x 100 = 2.66%