-17.51% is the change from 811 to 669
Calculation steps:
[( 669 - 811 ) ÷ 811] x 100 = -17.51%
Formula
Percentage change = [(669 - 811) / 811] x 100
Subtract the new number by the original number
669 - 811 = -142
-142 ÷ 811 = -0.17509247842170161
-0.17509247842170161 x 100 = -17.51%