-33.47% is the change from 968 to 644
Calculation steps:
[( 644 - 968 ) ÷ 968] x 100 = -33.47%
Formula
Percentage change = [(644 - 968) / 968] x 100
Subtract the new number by the original number
644 - 968 = -324
-324 ÷ 968 = -0.3347107438016529
-0.3347107438016529 x 100 = -33.47%