-96.44% is the change from 505 to 18
Calculation steps:
[( 18 - 505 ) ÷ 505] x 100 = -96.44%
Formula
Percentage change = [(18 - 505) / 505] x 100
Subtract the new number by the original number
18 - 505 = -487
-487 ÷ 505 = -0.9643564356435643
-0.9643564356435643 x 100 = -96.44%