-88.52% is the change from 671 to 77
Calculation steps:
[( 77 - 671 ) ÷ 671] x 100 = -88.52%
Formula
Percentage change = [(77 - 671) / 671] x 100
Subtract the new number by the original number
77 - 671 = -594
-594 ÷ 671 = -0.8852459016393442
-0.8852459016393442 x 100 = -88.52%