-33.3% is the change from 964 to 643
Calculation steps:
[( 643 - 964 ) ÷ 964] x 100 = -33.3%
Formula
Percentage change = [(643 - 964) / 964] x 100
Subtract the new number by the original number
643 - 964 = -321
-321 ÷ 964 = -0.3329875518672199
-0.3329875518672199 x 100 = -33.3%