-99.58% is the change from 721 to 3
Calculation steps:
[( 3 - 721 ) ÷ 721] x 100 = -99.58%
Formula
Percentage change = [(3 - 721) / 721] x 100
Subtract the new number by the original number
3 - 721 = -718
-718 ÷ 721 = -0.9958391123439667
-0.9958391123439667 x 100 = -99.58%