-30.74% is the change from 927 to 642
Calculation steps:
[( 642 - 927 ) ÷ 927] x 100 = -30.74%
Formula
Percentage change = [(642 - 927) / 927] x 100
Subtract the new number by the original number
642 - 927 = -285
-285 ÷ 927 = -0.3074433656957929
-0.3074433656957929 x 100 = -30.74%