-94.89% is the change from 665 to 34
Calculation steps:
[( 34 - 665 ) ÷ 665] x 100 = -94.89%
Formula
Percentage change = [(34 - 665) / 665] x 100
Subtract the new number by the original number
34 - 665 = -631
-631 ÷ 665 = -0.9488721804511279
-0.9488721804511279 x 100 = -94.89%