-16.85% is the change from 801 to 666
Calculation steps:
[( 666 - 801 ) ÷ 801] x 100 = -16.85%
Formula
Percentage change = [(666 - 801) / 801] x 100
Subtract the new number by the original number
666 - 801 = -135
-135 ÷ 801 = -0.16853932584269662
-0.16853932584269662 x 100 = -16.85%