-76.68% is the change from 639 to 149
Calculation steps:
[( 149 - 639 ) ÷ 639] x 100 = -76.68%
Formula
Percentage change = [(149 - 639) / 639] x 100
Subtract the new number by the original number
149 - 639 = -490
-490 ÷ 639 = -0.7668231611893583
-0.7668231611893583 x 100 = -76.68%