-51.96% is the change from 664 to 319
Calculation steps:
[( 319 - 664 ) ÷ 664] x 100 = -51.96%
Formula
Percentage change = [(319 - 664) / 664] x 100
Subtract the new number by the original number
319 - 664 = -345
-345 ÷ 664 = -0.5195783132530121
-0.5195783132530121 x 100 = -51.96%