-2.24% is the change from 891 to 871
Calculation steps:
[( 871 - 891 ) ÷ 891] x 100 = -2.24%
Formula
Percentage change = [(871 - 891) / 891] x 100
Subtract the new number by the original number
871 - 891 = -20
-20 ÷ 891 = -0.02244668911335578
-0.02244668911335578 x 100 = -2.24%