-1.78% is the change from 843 to 828
Calculation steps:
[( 828 - 843 ) ÷ 843] x 100 = -1.78%
Formula
Percentage change = [(828 - 843) / 843] x 100
Subtract the new number by the original number
828 - 843 = -15
-15 ÷ 843 = -0.017793594306049824
-0.017793594306049824 x 100 = -1.78%