-19.22% is the change from 666 to 538
Calculation steps:
[( 538 - 666 ) ÷ 666] x 100 = -19.22%
Formula
Percentage change = [(538 - 666) / 666] x 100
Subtract the new number by the original number
538 - 666 = -128
-128 ÷ 666 = -0.1921921921921922
-0.1921921921921922 x 100 = -19.22%