-71.99% is the change from 639 to 179
Calculation steps:
[( 179 - 639 ) ÷ 639] x 100 = -71.99%
Formula
Percentage change = [(179 - 639) / 639] x 100
Subtract the new number by the original number
179 - 639 = -460
-460 ÷ 639 = -0.7198748043818466
-0.7198748043818466 x 100 = -71.99%