-1.9% is the change from 630 to 618
Calculation steps:
[( 618 - 630 ) ÷ 630] x 100 = -1.9%
Formula
Percentage change = [(618 - 630) / 630] x 100
Subtract the new number by the original number
618 - 630 = -12
-12 ÷ 630 = -0.01904761904761905
-0.01904761904761905 x 100 = -1.9%