-89.11% is the change from 836 to 91
Calculation steps:
[( 91 - 836 ) ÷ 836] x 100 = -89.11%
Formula
Percentage change = [(91 - 836) / 836] x 100
Subtract the new number by the original number
91 - 836 = -745
-745 ÷ 836 = -0.8911483253588517
-0.8911483253588517 x 100 = -89.11%