-97.01% is the change from 669 to 20
Calculation steps:
[( 20 - 669 ) ÷ 669] x 100 = -97.01%
Formula
Percentage change = [(20 - 669) / 669] x 100
Subtract the new number by the original number
20 - 669 = -649
-649 ÷ 669 = -0.9701046337817638
-0.9701046337817638 x 100 = -97.01%