-91.19% is the change from 919 to 81
Calculation steps:
[( 81 - 919 ) ÷ 919] x 100 = -91.19%
Formula
Percentage change = [(81 - 919) / 919] x 100
Subtract the new number by the original number
81 - 919 = -838
-838 ÷ 919 = -0.911860718171926
-0.911860718171926 x 100 = -91.19%