4.87% is the change from 637 to 668
Calculation steps:
[( 668 - 637 ) ÷ 637] x 100 = 4.87%
Formula
Percentage change = [(668 - 637) / 637] x 100
Subtract the new number by the original number
668 - 637 = 31
31 ÷ 637 = 0.04866562009419152
0.04866562009419152 x 100 = 4.87%