-98.35% is the change from 665 to 11
Calculation steps:
[( 11 - 665 ) ÷ 665] x 100 = -98.35%
Formula
Percentage change = [(11 - 665) / 665] x 100
Subtract the new number by the original number
11 - 665 = -654
-654 ÷ 665 = -0.9834586466165414
-0.9834586466165414 x 100 = -98.35%