-20.64% is the change from 838 to 665
Calculation steps:
[( 665 - 838 ) ÷ 838] x 100 = -20.64%
Formula
Percentage change = [(665 - 838) / 838] x 100
Subtract the new number by the original number
665 - 838 = -173
-173 ÷ 838 = -0.2064439140811456
-0.2064439140811456 x 100 = -20.64%