-78.68% is the change from 666 to 142
Calculation steps:
[( 142 - 666 ) ÷ 666] x 100 = -78.68%
Formula
Percentage change = [(142 - 666) / 666] x 100
Subtract the new number by the original number
142 - 666 = -524
-524 ÷ 666 = -0.7867867867867868
-0.7867867867867868 x 100 = -78.68%