-31.26% is the change from 934 to 642
Calculation steps:
[( 642 - 934 ) ÷ 934] x 100 = -31.26%
Formula
Percentage change = [(642 - 934) / 934] x 100
Subtract the new number by the original number
642 - 934 = -292
-292 ÷ 934 = -0.31263383297644537
-0.31263383297644537 x 100 = -31.26%