-20.3% is the change from 665 to 530
Calculation steps:
[( 530 - 665 ) ÷ 665] x 100 = -20.3%
Formula
Percentage change = [(530 - 665) / 665] x 100
Subtract the new number by the original number
530 - 665 = -135
-135 ÷ 665 = -0.20300751879699247
-0.20300751879699247 x 100 = -20.3%