-1.43% is the change from 842 to 830
Calculation steps:
[( 830 - 842 ) ÷ 842] x 100 = -1.43%
Formula
Percentage change = [(830 - 842) / 842] x 100
Subtract the new number by the original number
830 - 842 = -12
-12 ÷ 842 = -0.014251781472684086
-0.014251781472684086 x 100 = -1.43%