-99.53% is the change from 641 to 3
Calculation steps:
[( 3 - 641 ) ÷ 641] x 100 = -99.53%
Formula
Percentage change = [(3 - 641) / 641] x 100
Subtract the new number by the original number
3 - 641 = -638
-638 ÷ 641 = -0.9953198127925117
-0.9953198127925117 x 100 = -99.53%