-1.55% is the change from 644 to 634
Calculation steps:
[( 634 - 644 ) ÷ 644] x 100 = -1.55%
Formula
Percentage change = [(634 - 644) / 644] x 100
Subtract the new number by the original number
634 - 644 = -10
-10 ÷ 644 = -0.015527950310559006
-0.015527950310559006 x 100 = -1.55%