-97.44% is the change from 507 to 13
Calculation steps:
[( 13 - 507 ) ÷ 507] x 100 = -97.44%
Formula
Percentage change = [(13 - 507) / 507] x 100
Subtract the new number by the original number
13 - 507 = -494
-494 ÷ 507 = -0.9743589743589743
-0.9743589743589743 x 100 = -97.44%