-61.45% is the change from 664 to 256
Calculation steps:
[( 256 - 664 ) ÷ 664] x 100 = -61.45%
Formula
Percentage change = [(256 - 664) / 664] x 100
Subtract the new number by the original number
256 - 664 = -408
-408 ÷ 664 = -0.6144578313253012
-0.6144578313253012 x 100 = -61.45%