-0.5% is the change from 991 to 986
Calculation steps:
[( 986 - 991 ) ÷ 991] x 100 = -0.5%
Formula
Percentage change = [(986 - 991) / 991] x 100
Subtract the new number by the original number
986 - 991 = -5
-5 ÷ 991 = -0.005045408678102927
-0.005045408678102927 x 100 = -0.5%