-17.98% is the change from 784 to 643
Calculation steps:
[( 643 - 784 ) ÷ 784] x 100 = -17.98%
Formula
Percentage change = [(643 - 784) / 784] x 100
Subtract the new number by the original number
643 - 784 = -141
-141 ÷ 784 = -0.1798469387755102
-0.1798469387755102 x 100 = -17.98%