-1.58% is the change from 634 to 624
Calculation steps:
[( 624 - 634 ) ÷ 634] x 100 = -1.58%
Formula
Percentage change = [(624 - 634) / 634] x 100
Subtract the new number by the original number
624 - 634 = -10
-10 ÷ 634 = -0.015772870662460567
-0.015772870662460567 x 100 = -1.58%