-17.47% is the change from 813 to 671
Calculation steps:
[( 671 - 813 ) ÷ 813] x 100 = -17.47%
Formula
Percentage change = [(671 - 813) / 813] x 100
Subtract the new number by the original number
671 - 813 = -142
-142 ÷ 813 = -0.17466174661746617
-0.17466174661746617 x 100 = -17.47%