-37.26% is the change from 671 to 421
Calculation steps:
[( 421 - 671 ) ÷ 671] x 100 = -37.26%
Formula
Percentage change = [(421 - 671) / 671] x 100
Subtract the new number by the original number
421 - 671 = -250
-250 ÷ 671 = -0.37257824143070045
-0.37257824143070045 x 100 = -37.26%