-90.4% is the change from 844 to 81
Calculation steps:
[( 81 - 844 ) ÷ 844] x 100 = -90.4%
Formula
Percentage change = [(81 - 844) / 844] x 100
Subtract the new number by the original number
81 - 844 = -763
-763 ÷ 844 = -0.9040284360189573
-0.9040284360189573 x 100 = -90.4%