-32.81% is the change from 957 to 643
Calculation steps:
[( 643 - 957 ) ÷ 957] x 100 = -32.81%
Formula
Percentage change = [(643 - 957) / 957] x 100
Subtract the new number by the original number
643 - 957 = -314
-314 ÷ 957 = -0.3281086729362591
-0.3281086729362591 x 100 = -32.81%