-90.31% is the change from 681 to 66
Calculation steps:
[( 66 - 681 ) ÷ 681] x 100 = -90.31%
Formula
Percentage change = [(66 - 681) / 681] x 100
Subtract the new number by the original number
66 - 681 = -615
-615 ÷ 681 = -0.9030837004405287
-0.9030837004405287 x 100 = -90.31%