-21.01% is the change from 671 to 530
Calculation steps:
[( 530 - 671 ) ÷ 671] x 100 = -21.01%
Formula
Percentage change = [(530 - 671) / 671] x 100
Subtract the new number by the original number
530 - 671 = -141
-141 ÷ 671 = -0.21013412816691504
-0.21013412816691504 x 100 = -21.01%