-90.99% is the change from 666 to 60
Calculation steps:
[( 60 - 666 ) ÷ 666] x 100 = -90.99%
Formula
Percentage change = [(60 - 666) / 666] x 100
Subtract the new number by the original number
60 - 666 = -606
-606 ÷ 666 = -0.9099099099099099
-0.9099099099099099 x 100 = -90.99%