-10.68% is the change from 721 to 644
Calculation steps:
[( 644 - 721 ) ÷ 721] x 100 = -10.68%
Formula
Percentage change = [(644 - 721) / 721] x 100
Subtract the new number by the original number
644 - 721 = -77
-77 ÷ 721 = -0.10679611650485436
-0.10679611650485436 x 100 = -10.68%