-51.2% is the change from 666 to 325
Calculation steps:
[( 325 - 666 ) ÷ 666] x 100 = -51.2%
Formula
Percentage change = [(325 - 666) / 666] x 100
Subtract the new number by the original number
325 - 666 = -341
-341 ÷ 666 = -0.512012012012012
-0.512012012012012 x 100 = -51.2%