-88.97% is the change from 816 to 90
Calculation steps:
[( 90 - 816 ) ÷ 816] x 100 = -88.97%
Formula
Percentage change = [(90 - 816) / 816] x 100
Subtract the new number by the original number
90 - 816 = -726
-726 ÷ 816 = -0.8897058823529411
-0.8897058823529411 x 100 = -88.97%