-96.25% is the change from 507 to 19
Calculation steps:
[( 19 - 507 ) ÷ 507] x 100 = -96.25%
Formula
Percentage change = [(19 - 507) / 507] x 100
Subtract the new number by the original number
19 - 507 = -488
-488 ÷ 507 = -0.9625246548323472
-0.9625246548323472 x 100 = -96.25%