-86.51% is the change from 667 to 90
Calculation steps:
[( 90 - 667 ) ÷ 667] x 100 = -86.51%
Formula
Percentage change = [(90 - 667) / 667] x 100
Subtract the new number by the original number
90 - 667 = -577
-577 ÷ 667 = -0.8650674662668666
-0.8650674662668666 x 100 = -86.51%