-12.64% is the change from 815 to 712
Calculation steps:
[( 712 - 815 ) ÷ 815] x 100 = -12.64%
Formula
Percentage change = [(712 - 815) / 815] x 100
Subtract the new number by the original number
712 - 815 = -103
-103 ÷ 815 = -0.1263803680981595
-0.1263803680981595 x 100 = -12.64%