-6.19% is the change from 97 to 91
Calculation steps:
[( 91 - 97 ) ÷ 97] x 100 = -6.19%
Formula
Percentage change = [(91 - 97) / 97] x 100
Subtract the new number by the original number
91 - 97 = -6
-6 ÷ 97 = -0.061855670103092786
-0.061855670103092786 x 100 = -6.19%