-0.93% is the change from 647 to 641
Calculation steps:
[( 641 - 647 ) ÷ 647] x 100 = -0.93%
Formula
Percentage change = [(641 - 647) / 647] x 100
Subtract the new number by the original number
641 - 647 = -6
-6 ÷ 647 = -0.00927357032457496
-0.00927357032457496 x 100 = -0.93%