-33.19% is the change from 961 to 642
Calculation steps:
[( 642 - 961 ) ÷ 961] x 100 = -33.19%
Formula
Percentage change = [(642 - 961) / 961] x 100
Subtract the new number by the original number
642 - 961 = -319
-319 ÷ 961 = -0.331945889698231
-0.331945889698231 x 100 = -33.19%