-5.16% is the change from 639 to 606
Calculation steps:
[( 606 - 639 ) ÷ 639] x 100 = -5.16%
Formula
Percentage change = [(606 - 639) / 639] x 100
Subtract the new number by the original number
606 - 639 = -33
-33 ÷ 639 = -0.051643192488262914
-0.051643192488262914 x 100 = -5.16%