-33.51% is the change from 967 to 643
Calculation steps:
[( 643 - 967 ) ÷ 967] x 100 = -33.51%
Formula
Percentage change = [(643 - 967) / 967] x 100
Subtract the new number by the original number
643 - 967 = -324
-324 ÷ 967 = -0.33505687693898656
-0.33505687693898656 x 100 = -33.51%