-41.2% is the change from 665 to 391
Calculation steps:
[( 391 - 665 ) ÷ 665] x 100 = -41.2%
Formula
Percentage change = [(391 - 665) / 665] x 100
Subtract the new number by the original number
391 - 665 = -274
-274 ÷ 665 = -0.4120300751879699
-0.4120300751879699 x 100 = -41.2%