-98.4% is the change from 999 to 16
Calculation steps:
[( 16 - 999 ) ÷ 999] x 100 = -98.4%
Formula
Percentage change = [(16 - 999) / 999] x 100
Subtract the new number by the original number
16 - 999 = -983
-983 ÷ 999 = -0.983983983983984
-0.983983983983984 x 100 = -98.4%