-19.92% is the change from 507 to 406
Calculation steps:
[( 406 - 507 ) ÷ 507] x 100 = -19.92%
Formula
Percentage change = [(406 - 507) / 507] x 100
Subtract the new number by the original number
406 - 507 = -101
-101 ÷ 507 = -0.1992110453648915
-0.1992110453648915 x 100 = -19.92%