-1.1% is the change from 639 to 632
Calculation steps:
[( 632 - 639 ) ÷ 639] x 100 = -1.1%
Formula
Percentage change = [(632 - 639) / 639] x 100
Subtract the new number by the original number
632 - 639 = -7
-7 ÷ 639 = -0.010954616588419406
-0.010954616588419406 x 100 = -1.1%