-33.68% is the change from 965 to 640
Calculation steps:
[( 640 - 965 ) ÷ 965] x 100 = -33.68%
Formula
Percentage change = [(640 - 965) / 965] x 100
Subtract the new number by the original number
640 - 965 = -325
-325 ÷ 965 = -0.33678756476683935
-0.33678756476683935 x 100 = -33.68%