-0.72% is the change from 836 to 830
Calculation steps:
[( 830 - 836 ) ÷ 836] x 100 = -0.72%
Formula
Percentage change = [(830 - 836) / 836] x 100
Subtract the new number by the original number
830 - 836 = -6
-6 ÷ 836 = -0.007177033492822967
-0.007177033492822967 x 100 = -0.72%