-20.86% is the change from 911 to 721
Calculation steps:
[( 721 - 911 ) ÷ 911] x 100 = -20.86%
Formula
Percentage change = [(721 - 911) / 911] x 100
Subtract the new number by the original number
721 - 911 = -190
-190 ÷ 911 = -0.20856201975850713
-0.20856201975850713 x 100 = -20.86%