-15.74% is the change from 991 to 835
Calculation steps:
[( 835 - 991 ) ÷ 991] x 100 = -15.74%
Formula
Percentage change = [(835 - 991) / 991] x 100
Subtract the new number by the original number
835 - 991 = -156
-156 ÷ 991 = -0.1574167507568113
-0.1574167507568113 x 100 = -15.74%