-2.83% is the change from 637 to 619
Calculation steps:
[( 619 - 637 ) ÷ 637] x 100 = -2.83%
Formula
Percentage change = [(619 - 637) / 637] x 100
Subtract the new number by the original number
619 - 637 = -18
-18 ÷ 637 = -0.0282574568288854
-0.0282574568288854 x 100 = -2.83%