-17.36% is the change from 812 to 671
Calculation steps:
[( 671 - 812 ) ÷ 812] x 100 = -17.36%
Formula
Percentage change = [(671 - 812) / 812] x 100
Subtract the new number by the original number
671 - 812 = -141
-141 ÷ 812 = -0.17364532019704434
-0.17364532019704434 x 100 = -17.36%