-1.87% is the change from 642 to 630
Calculation steps:
[( 630 - 642 ) ÷ 642] x 100 = -1.87%
Formula
Percentage change = [(630 - 642) / 642] x 100
Subtract the new number by the original number
630 - 642 = -12
-12 ÷ 642 = -0.018691588785046728
-0.018691588785046728 x 100 = -1.87%