-99.8% is the change from 504 to 1
Calculation steps:
[( 1 - 504 ) ÷ 504] x 100 = -99.8%
Formula
Percentage change = [(1 - 504) / 504] x 100
Subtract the new number by the original number
1 - 504 = -503
-503 ÷ 504 = -0.998015873015873
-0.998015873015873 x 100 = -99.8%