-99.9% is the change from 979 to 1
Calculation steps:
[( 1 - 979 ) ÷ 979] x 100 = -99.9%
Formula
Percentage change = [(1 - 979) / 979] x 100
Subtract the new number by the original number
1 - 979 = -978
-978 ÷ 979 = -0.9989785495403473
-0.9989785495403473 x 100 = -99.9%