-98.8% is the change from 83 to 1
Calculation steps:
[( 1 - 83 ) ÷ 83] x 100 = -98.8%
Formula
Percentage change = [(1 - 83) / 83] x 100
Subtract the new number by the original number
1 - 83 = -82
-82 ÷ 83 = -0.9879518072289156
-0.9879518072289156 x 100 = -98.8%