-89.96% is the change from 906 to 91
Calculation steps:
[( 91 - 906 ) ÷ 906] x 100 = -89.96%
Formula
Percentage change = [(91 - 906) / 906] x 100
Subtract the new number by the original number
91 - 906 = -815
-815 ÷ 906 = -0.8995584988962473
-0.8995584988962473 x 100 = -89.96%