-90.53% is the change from 961 to 91
Calculation steps:
[( 91 - 961 ) ÷ 961] x 100 = -90.53%
Formula
Percentage change = [(91 - 961) / 961] x 100
Subtract the new number by the original number
91 - 961 = -870
-870 ÷ 961 = -0.9053069719042663
-0.9053069719042663 x 100 = -90.53%