-91.71% is the change from 639 to 53
Calculation steps:
[( 53 - 639 ) ÷ 639] x 100 = -91.71%
Formula
Percentage change = [(53 - 639) / 639] x 100
Subtract the new number by the original number
53 - 639 = -586
-586 ÷ 639 = -0.917057902973396
-0.917057902973396 x 100 = -91.71%