-90.39% is the change from 947 to 91
Calculation steps:
[( 91 - 947 ) ÷ 947] x 100 = -90.39%
Formula
Percentage change = [(91 - 947) / 947] x 100
Subtract the new number by the original number
91 - 947 = -856
-856 ÷ 947 = -0.9039070749736009
-0.9039070749736009 x 100 = -90.39%