-33.3% is the change from 961 to 641
Calculation steps:
[( 641 - 961 ) ÷ 961] x 100 = -33.3%
Formula
Percentage change = [(641 - 961) / 961] x 100
Subtract the new number by the original number
641 - 961 = -320
-320 ÷ 961 = -0.33298647242455776
-0.33298647242455776 x 100 = -33.3%