-90.11% is the change from 991 to 98
Calculation steps:
[( 98 - 991 ) ÷ 991] x 100 = -90.11%
Formula
Percentage change = [(98 - 991) / 991] x 100
Subtract the new number by the original number
98 - 991 = -893
-893 ÷ 991 = -0.9011099899091827
-0.9011099899091827 x 100 = -90.11%