-90.23% is the change from 665 to 65
Calculation steps:
[( 65 - 665 ) ÷ 665] x 100 = -90.23%
Formula
Percentage change = [(65 - 665) / 665] x 100
Subtract the new number by the original number
65 - 665 = -600
-600 ÷ 665 = -0.9022556390977443
-0.9022556390977443 x 100 = -90.23%