-90.38% is the change from 863 to 83
Calculation steps:
[( 83 - 863 ) ÷ 863] x 100 = -90.38%
Formula
Percentage change = [(83 - 863) / 863] x 100
Subtract the new number by the original number
83 - 863 = -780
-780 ÷ 863 = -0.9038238702201622
-0.9038238702201622 x 100 = -90.38%