-77.44% is the change from 665 to 150
Calculation steps:
[( 150 - 665 ) ÷ 665] x 100 = -77.44%
Formula
Percentage change = [(150 - 665) / 665] x 100
Subtract the new number by the original number
150 - 665 = -515
-515 ÷ 665 = -0.7744360902255639
-0.7744360902255639 x 100 = -77.44%