-95.78% is the change from 664 to 28
Calculation steps:
[( 28 - 664 ) ÷ 664] x 100 = -95.78%
Formula
Percentage change = [(28 - 664) / 664] x 100
Subtract the new number by the original number
28 - 664 = -636
-636 ÷ 664 = -0.9578313253012049
-0.9578313253012049 x 100 = -95.78%