-17.26% is the change from 811 to 671
Calculation steps:
[( 671 - 811 ) ÷ 811] x 100 = -17.26%
Formula
Percentage change = [(671 - 811) / 811] x 100
Subtract the new number by the original number
671 - 811 = -140
-140 ÷ 811 = -0.17262638717632553
-0.17262638717632553 x 100 = -17.26%