-1.25% is the change from 642 to 634
Calculation steps:
[( 634 - 642 ) ÷ 642] x 100 = -1.25%
Formula
Percentage change = [(634 - 642) / 642] x 100
Subtract the new number by the original number
634 - 642 = -8
-8 ÷ 642 = -0.012461059190031152
-0.012461059190031152 x 100 = -1.25%