-84.66% is the change from 665 to 102
Calculation steps:
[( 102 - 665 ) ÷ 665] x 100 = -84.66%
Formula
Percentage change = [(102 - 665) / 665] x 100
Subtract the new number by the original number
102 - 665 = -563
-563 ÷ 665 = -0.8466165413533835
-0.8466165413533835 x 100 = -84.66%