-4.85% is the change from 639 to 608
Calculation steps:
[( 608 - 639 ) ÷ 639] x 100 = -4.85%
Formula
Percentage change = [(608 - 639) / 639] x 100
Subtract the new number by the original number
608 - 639 = -31
-31 ÷ 639 = -0.048513302034428794
-0.048513302034428794 x 100 = -4.85%