-15.48% is the change from 756 to 639
Calculation steps:
[( 639 - 756 ) ÷ 756] x 100 = -15.48%
Formula
Percentage change = [(639 - 756) / 756] x 100
Subtract the new number by the original number
639 - 756 = -117
-117 ÷ 756 = -0.15476190476190477
-0.15476190476190477 x 100 = -15.48%