-36.75% is the change from 664 to 420
Calculation steps:
[( 420 - 664 ) ÷ 664] x 100 = -36.75%
Formula
Percentage change = [(420 - 664) / 664] x 100
Subtract the new number by the original number
420 - 664 = -244
-244 ÷ 664 = -0.3674698795180723
-0.3674698795180723 x 100 = -36.75%