-33.2% is the change from 964 to 644
Calculation steps:
[( 644 - 964 ) ÷ 964] x 100 = -33.2%
Formula
Percentage change = [(644 - 964) / 964] x 100
Subtract the new number by the original number
644 - 964 = -320
-320 ÷ 964 = -0.33195020746887965
-0.33195020746887965 x 100 = -33.2%