-30.1% is the change from 721 to 504
Calculation steps:
[( 504 - 721 ) ÷ 721] x 100 = -30.1%
Formula
Percentage change = [(504 - 721) / 721] x 100
Subtract the new number by the original number
504 - 721 = -217
-217 ÷ 721 = -0.30097087378640774
-0.30097087378640774 x 100 = -30.1%