-89.57% is the change from 671 to 70
Calculation steps:
[( 70 - 671 ) ÷ 671] x 100 = -89.57%
Formula
Percentage change = [(70 - 671) / 671] x 100
Subtract the new number by the original number
70 - 671 = -601
-601 ÷ 671 = -0.8956780923994039
-0.8956780923994039 x 100 = -89.57%