-99.21% is the change from 507 to 4
Calculation steps:
[( 4 - 507 ) ÷ 507] x 100 = -99.21%
Formula
Percentage change = [(4 - 507) / 507] x 100
Subtract the new number by the original number
4 - 507 = -503
-503 ÷ 507 = -0.9921104536489151
-0.9921104536489151 x 100 = -99.21%