-17.88% is the change from 811 to 666
Calculation steps:
[( 666 - 811 ) ÷ 811] x 100 = -17.88%
Formula
Percentage change = [(666 - 811) / 811] x 100
Subtract the new number by the original number
666 - 811 = -145
-145 ÷ 811 = -0.17879161528976573
-0.17879161528976573 x 100 = -17.88%