-84.8% is the change from 671 to 102
Calculation steps:
[( 102 - 671 ) ÷ 671] x 100 = -84.8%
Formula
Percentage change = [(102 - 671) / 671] x 100
Subtract the new number by the original number
102 - 671 = -569
-569 ÷ 671 = -0.8479880774962743
-0.8479880774962743 x 100 = -84.8%