-90.77% is the change from 639 to 59
Calculation steps:
[( 59 - 639 ) ÷ 639] x 100 = -90.77%
Formula
Percentage change = [(59 - 639) / 639] x 100
Subtract the new number by the original number
59 - 639 = -580
-580 ÷ 639 = -0.9076682316118936
-0.9076682316118936 x 100 = -90.77%