-29.13% is the change from 721 to 511
Calculation steps:
[( 511 - 721 ) ÷ 721] x 100 = -29.13%
Formula
Percentage change = [(511 - 721) / 721] x 100
Subtract the new number by the original number
511 - 721 = -210
-210 ÷ 721 = -0.2912621359223301
-0.2912621359223301 x 100 = -29.13%