-30.14% is the change from 919 to 642
Calculation steps:
[( 642 - 919 ) ÷ 919] x 100 = -30.14%
Formula
Percentage change = [(642 - 919) / 919] x 100
Subtract the new number by the original number
642 - 919 = -277
-277 ÷ 919 = -0.3014145810663765
-0.3014145810663765 x 100 = -30.14%