-90.83% is the change from 665 to 61
Calculation steps:
[( 61 - 665 ) ÷ 665] x 100 = -90.83%
Formula
Percentage change = [(61 - 665) / 665] x 100
Subtract the new number by the original number
61 - 665 = -604
-604 ÷ 665 = -0.9082706766917293
-0.9082706766917293 x 100 = -90.83%