-2.03% is the change from 639 to 626
Calculation steps:
[( 626 - 639 ) ÷ 639] x 100 = -2.03%
Formula
Percentage change = [(626 - 639) / 639] x 100
Subtract the new number by the original number
626 - 639 = -13
-13 ÷ 639 = -0.02034428794992175
-0.02034428794992175 x 100 = -2.03%