-76.13% is the change from 666 to 159
Calculation steps:
[( 159 - 666 ) ÷ 666] x 100 = -76.13%
Formula
Percentage change = [(159 - 666) / 666] x 100
Subtract the new number by the original number
159 - 666 = -507
-507 ÷ 666 = -0.7612612612612613
-0.7612612612612613 x 100 = -76.13%