-6.85% is the change from 891 to 830
Calculation steps:
[( 830 - 891 ) ÷ 891] x 100 = -6.85%
Formula
Percentage change = [(830 - 891) / 891] x 100
Subtract the new number by the original number
830 - 891 = -61
-61 ÷ 891 = -0.06846240179573512
-0.06846240179573512 x 100 = -6.85%