-76.69% is the change from 665 to 155
Calculation steps:
[( 155 - 665 ) ÷ 665] x 100 = -76.69%
Formula
Percentage change = [(155 - 665) / 665] x 100
Subtract the new number by the original number
155 - 665 = -510
-510 ÷ 665 = -0.7669172932330827
-0.7669172932330827 x 100 = -76.69%