-17.67% is the change from 781 to 643
Calculation steps:
[( 643 - 781 ) ÷ 781] x 100 = -17.67%
Formula
Percentage change = [(643 - 781) / 781] x 100
Subtract the new number by the original number
643 - 781 = -138
-138 ÷ 781 = -0.176696542893726
-0.176696542893726 x 100 = -17.67%