-4.17% is the change from 815 to 781
Calculation steps:
[( 781 - 815 ) ÷ 815] x 100 = -4.17%
Formula
Percentage change = [(781 - 815) / 815] x 100
Subtract the new number by the original number
781 - 815 = -34
-34 ÷ 815 = -0.04171779141104295
-0.04171779141104295 x 100 = -4.17%