-49.4% is the change from 664 to 336
Calculation steps:
[( 336 - 664 ) ÷ 664] x 100 = -49.4%
Formula
Percentage change = [(336 - 664) / 664] x 100
Subtract the new number by the original number
336 - 664 = -328
-328 ÷ 664 = -0.4939759036144578
-0.4939759036144578 x 100 = -49.4%