-99.64% is the change from 279 to 1
Calculation steps:
[( 1 - 279 ) ÷ 279] x 100 = -99.64%
Formula
Percentage change = [(1 - 279) / 279] x 100
Subtract the new number by the original number
1 - 279 = -278
-278 ÷ 279 = -0.996415770609319
-0.996415770609319 x 100 = -99.64%