-84.26% is the change from 991 to 156
Calculation steps:
[( 156 - 991 ) ÷ 991] x 100 = -84.26%
Formula
Percentage change = [(156 - 991) / 991] x 100
Subtract the new number by the original number
156 - 991 = -835
-835 ÷ 991 = -0.8425832492431887
-0.8425832492431887 x 100 = -84.26%