-2.94% is the change from 647 to 628
Calculation steps:
[( 628 - 647 ) ÷ 647] x 100 = -2.94%
Formula
Percentage change = [(628 - 647) / 647] x 100
Subtract the new number by the original number
628 - 647 = -19
-19 ÷ 647 = -0.02936630602782071
-0.02936630602782071 x 100 = -2.94%