-18.3% is the change from 787 to 643
Calculation steps:
[( 643 - 787 ) ÷ 787] x 100 = -18.3%
Formula
Percentage change = [(643 - 787) / 787] x 100
Subtract the new number by the original number
643 - 787 = -144
-144 ÷ 787 = -0.18297331639135958
-0.18297331639135958 x 100 = -18.3%