1.27% is the change from 632 to 640
Calculation steps:
[( 640 - 632 ) ÷ 632] x 100 = 1.27%
Formula
Percentage change = [(640 - 632) / 632] x 100
Subtract the new number by the original number
640 - 632 = 8
8 ÷ 632 = 0.012658227848101266
0.012658227848101266 x 100 = 1.27%