-29.68% is the change from 721 to 507
Calculation steps:
[( 507 - 721 ) ÷ 721] x 100 = -29.68%
Formula
Percentage change = [(507 - 721) / 721] x 100
Subtract the new number by the original number
507 - 721 = -214
-214 ÷ 721 = -0.29680998613037446
-0.29680998613037446 x 100 = -29.68%