-28.99% is the change from 721 to 512
Calculation steps:
[( 512 - 721 ) ÷ 721] x 100 = -28.99%
Formula
Percentage change = [(512 - 721) / 721] x 100
Subtract the new number by the original number
512 - 721 = -209
-209 ÷ 721 = -0.289875173370319
-0.289875173370319 x 100 = -28.99%