-98.05% is the change from 665 to 13
Calculation steps:
[( 13 - 665 ) ÷ 665] x 100 = -98.05%
Formula
Percentage change = [(13 - 665) / 665] x 100
Subtract the new number by the original number
13 - 665 = -652
-652 ÷ 665 = -0.9804511278195489
-0.9804511278195489 x 100 = -98.05%