-51.51% is the change from 664 to 322
Calculation steps:
[( 322 - 664 ) ÷ 664] x 100 = -51.51%
Formula
Percentage change = [(322 - 664) / 664] x 100
Subtract the new number by the original number
322 - 664 = -342
-342 ÷ 664 = -0.5150602409638554
-0.5150602409638554 x 100 = -51.51%