-17.44% is the change from 774 to 639
Calculation steps:
[( 639 - 774 ) ÷ 774] x 100 = -17.44%
Formula
Percentage change = [(639 - 774) / 774] x 100
Subtract the new number by the original number
639 - 774 = -135
-135 ÷ 774 = -0.1744186046511628
-0.1744186046511628 x 100 = -17.44%