-3.5% is the change from 828 to 799
Calculation steps:
[( 799 - 828 ) ÷ 828] x 100 = -3.5%
Formula
Percentage change = [(799 - 828) / 828] x 100
Subtract the new number by the original number
799 - 828 = -29
-29 ÷ 828 = -0.035024154589371984
-0.035024154589371984 x 100 = -3.5%