-30.51% is the change from 721 to 501
Calculation steps:
[( 501 - 721 ) ÷ 721] x 100 = -30.51%
Formula
Percentage change = [(501 - 721) / 721] x 100
Subtract the new number by the original number
501 - 721 = -220
-220 ÷ 721 = -0.30513176144244103
-0.30513176144244103 x 100 = -30.51%