-20.77% is the change from 910 to 721
Calculation steps:
[( 721 - 910 ) ÷ 910] x 100 = -20.77%
Formula
Percentage change = [(721 - 910) / 910] x 100
Subtract the new number by the original number
721 - 910 = -189
-189 ÷ 910 = -0.2076923076923077
-0.2076923076923077 x 100 = -20.77%