-21.55% is the change from 919 to 721
Calculation steps:
[( 721 - 919 ) ÷ 919] x 100 = -21.55%
Formula
Percentage change = [(721 - 919) / 919] x 100
Subtract the new number by the original number
721 - 919 = -198
-198 ÷ 919 = -0.21545157780195864
-0.21545157780195864 x 100 = -21.55%