-85.29% is the change from 639 to 94
Calculation steps:
[( 94 - 639 ) ÷ 639] x 100 = -85.29%
Formula
Percentage change = [(94 - 639) / 639] x 100
Subtract the new number by the original number
94 - 639 = -545
-545 ÷ 639 = -0.8528951486697965
-0.8528951486697965 x 100 = -85.29%