-15.83% is the change from 638 to 537
Calculation steps:
[( 537 - 638 ) ÷ 638] x 100 = -15.83%
Formula
Percentage change = [(537 - 638) / 638] x 100
Subtract the new number by the original number
537 - 638 = -101
-101 ÷ 638 = -0.15830721003134796
-0.15830721003134796 x 100 = -15.83%