-15.54% is the change from 991 to 837
Calculation steps:
[( 837 - 991 ) ÷ 991] x 100 = -15.54%
Formula
Percentage change = [(837 - 991) / 991] x 100
Subtract the new number by the original number
837 - 991 = -154
-154 ÷ 991 = -0.15539858728557013
-0.15539858728557013 x 100 = -15.54%