-33.23% is the change from 963 to 643
Calculation steps:
[( 643 - 963 ) ÷ 963] x 100 = -33.23%
Formula
Percentage change = [(643 - 963) / 963] x 100
Subtract the new number by the original number
643 - 963 = -320
-320 ÷ 963 = -0.3322949117341641
-0.3322949117341641 x 100 = -33.23%