-35.84% is the change from 999 to 641
Calculation steps:
[( 641 - 999 ) ÷ 999] x 100 = -35.84%
Formula
Percentage change = [(641 - 999) / 999] x 100
Subtract the new number by the original number
641 - 999 = -358
-358 ÷ 999 = -0.35835835835835833
-0.35835835835835833 x 100 = -35.84%