-99.25% is the change from 665 to 5
Calculation steps:
[( 5 - 665 ) ÷ 665] x 100 = -99.25%
Formula
Percentage change = [(5 - 665) / 665] x 100
Subtract the new number by the original number
5 - 665 = -660
-660 ÷ 665 = -0.9924812030075187
-0.9924812030075187 x 100 = -99.25%