-2.01% is the change from 847 to 830
Calculation steps:
[( 830 - 847 ) ÷ 847] x 100 = -2.01%
Formula
Percentage change = [(830 - 847) / 847] x 100
Subtract the new number by the original number
830 - 847 = -17
-17 ÷ 847 = -0.020070838252656435
-0.020070838252656435 x 100 = -2.01%