-1.5% is the change from 665 to 655
Calculation steps:
[( 655 - 665 ) ÷ 665] x 100 = -1.5%
Formula
Percentage change = [(655 - 665) / 665] x 100
Subtract the new number by the original number
655 - 665 = -10
-10 ÷ 665 = -0.015037593984962405
-0.015037593984962405 x 100 = -1.5%