-21.12% is the change from 838 to 661
Calculation steps:
[( 661 - 838 ) ÷ 838] x 100 = -21.12%
Formula
Percentage change = [(661 - 838) / 838] x 100
Subtract the new number by the original number
661 - 838 = -177
-177 ÷ 838 = -0.21121718377088305
-0.21121718377088305 x 100 = -21.12%