-89.78% is the change from 685 to 70
Calculation steps:
[( 70 - 685 ) ÷ 685] x 100 = -89.78%
Formula
Percentage change = [(70 - 685) / 685] x 100
Subtract the new number by the original number
70 - 685 = -615
-615 ÷ 685 = -0.8978102189781022
-0.8978102189781022 x 100 = -89.78%