-22.56% is the change from 665 to 515
Calculation steps:
[( 515 - 665 ) ÷ 665] x 100 = -22.56%
Formula
Percentage change = [(515 - 665) / 665] x 100
Subtract the new number by the original number
515 - 665 = -150
-150 ÷ 665 = -0.22556390977443608
-0.22556390977443608 x 100 = -22.56%