-19.97% is the change from 721 to 577
Calculation steps:
[( 577 - 721 ) ÷ 721] x 100 = -19.97%
Formula
Percentage change = [(577 - 721) / 721] x 100
Subtract the new number by the original number
577 - 721 = -144
-144 ÷ 721 = -0.19972260748959778
-0.19972260748959778 x 100 = -19.97%