-98.21% is the change from 503 to 9
Calculation steps:
[( 9 - 503 ) ÷ 503] x 100 = -98.21%
Formula
Percentage change = [(9 - 503) / 503] x 100
Subtract the new number by the original number
9 - 503 = -494
-494 ÷ 503 = -0.9821073558648111
-0.9821073558648111 x 100 = -98.21%