-23.15% is the change from 838 to 644
Calculation steps:
[( 644 - 838 ) ÷ 838] x 100 = -23.15%
Formula
Percentage change = [(644 - 838) / 838] x 100
Subtract the new number by the original number
644 - 838 = -194
-194 ÷ 838 = -0.2315035799522673
-0.2315035799522673 x 100 = -23.15%