-6.55% is the change from 641 to 599
Calculation steps:
[( 599 - 641 ) ÷ 641] x 100 = -6.55%
Formula
Percentage change = [(599 - 641) / 641] x 100
Subtract the new number by the original number
599 - 641 = -42
-42 ÷ 641 = -0.0655226209048362
-0.0655226209048362 x 100 = -6.55%