-21.03% is the change from 913 to 721
Calculation steps:
[( 721 - 913 ) ÷ 913] x 100 = -21.03%
Formula
Percentage change = [(721 - 913) / 913] x 100
Subtract the new number by the original number
721 - 913 = -192
-192 ÷ 913 = -0.21029572836801752
-0.21029572836801752 x 100 = -21.03%