-41.55% is the change from 669 to 391
Calculation steps:
[( 391 - 669 ) ÷ 669] x 100 = -41.55%
Formula
Percentage change = [(391 - 669) / 669] x 100
Subtract the new number by the original number
391 - 669 = -278
-278 ÷ 669 = -0.4155455904334828
-0.4155455904334828 x 100 = -41.55%