-23.16% is the change from 665 to 511
Calculation steps:
[( 511 - 665 ) ÷ 665] x 100 = -23.16%
Formula
Percentage change = [(511 - 665) / 665] x 100
Subtract the new number by the original number
511 - 665 = -154
-154 ÷ 665 = -0.23157894736842105
-0.23157894736842105 x 100 = -23.16%