-19.91% is the change from 909 to 728
Calculation steps:
[( 728 - 909 ) ÷ 909] x 100 = -19.91%
Formula
Percentage change = [(728 - 909) / 909] x 100
Subtract the new number by the original number
728 - 909 = -181
-181 ÷ 909 = -0.19911991199119913
-0.19911991199119913 x 100 = -19.91%