-70.42% is the change from 639 to 189
Calculation steps:
[( 189 - 639 ) ÷ 639] x 100 = -70.42%
Formula
Percentage change = [(189 - 639) / 639] x 100
Subtract the new number by the original number
189 - 639 = -450
-450 ÷ 639 = -0.704225352112676
-0.704225352112676 x 100 = -70.42%