-50.75% is the change from 664 to 327
Calculation steps:
[( 327 - 664 ) ÷ 664] x 100 = -50.75%
Formula
Percentage change = [(327 - 664) / 664] x 100
Subtract the new number by the original number
327 - 664 = -337
-337 ÷ 664 = -0.5075301204819277
-0.5075301204819277 x 100 = -50.75%