-88.42% is the change from 639 to 74
Calculation steps:
[( 74 - 639 ) ÷ 639] x 100 = -88.42%
Formula
Percentage change = [(74 - 639) / 639] x 100
Subtract the new number by the original number
74 - 639 = -565
-565 ÷ 639 = -0.8841940532081377
-0.8841940532081377 x 100 = -88.42%