-4.49% is the change from 891 to 851
Calculation steps:
[( 851 - 891 ) ÷ 891] x 100 = -4.49%
Formula
Percentage change = [(851 - 891) / 891] x 100
Subtract the new number by the original number
851 - 891 = -40
-40 ÷ 891 = -0.04489337822671156
-0.04489337822671156 x 100 = -4.49%