-7.14% is the change from 98 to 91
Calculation steps:
[( 91 - 98 ) ÷ 98] x 100 = -7.14%
Formula
Percentage change = [(91 - 98) / 98] x 100
Subtract the new number by the original number
91 - 98 = -7
-7 ÷ 98 = -0.07142857142857142
-0.07142857142857142 x 100 = -7.14%