-24.59% is the change from 671 to 506
Calculation steps:
[( 506 - 671 ) ÷ 671] x 100 = -24.59%
Formula
Percentage change = [(506 - 671) / 671] x 100
Subtract the new number by the original number
506 - 671 = -165
-165 ÷ 671 = -0.2459016393442623
-0.2459016393442623 x 100 = -24.59%