-96.45% is the change from 507 to 18
Calculation steps:
[( 18 - 507 ) ÷ 507] x 100 = -96.45%
Formula
Percentage change = [(18 - 507) / 507] x 100
Subtract the new number by the original number
18 - 507 = -489
-489 ÷ 507 = -0.9644970414201184
-0.9644970414201184 x 100 = -96.45%