-96.42% is the change from 503 to 18
Calculation steps:
[( 18 - 503 ) ÷ 503] x 100 = -96.42%
Formula
Percentage change = [(18 - 503) / 503] x 100
Subtract the new number by the original number
18 - 503 = -485
-485 ÷ 503 = -0.9642147117296223
-0.9642147117296223 x 100 = -96.42%