-90.64% is the change from 972 to 91
Calculation steps:
[( 91 - 972 ) ÷ 972] x 100 = -90.64%
Formula
Percentage change = [(91 - 972) / 972] x 100
Subtract the new number by the original number
91 - 972 = -881
-881 ÷ 972 = -0.9063786008230452
-0.9063786008230452 x 100 = -90.64%