-32.59% is the change from 948 to 639
Calculation steps:
[( 639 - 948 ) ÷ 948] x 100 = -32.59%
Formula
Percentage change = [(639 - 948) / 948] x 100
Subtract the new number by the original number
639 - 948 = -309
-309 ÷ 948 = -0.3259493670886076
-0.3259493670886076 x 100 = -32.59%