-31.7% is the change from 470 to 321
Calculation steps:
[( 321 - 470 ) ÷ 470] x 100 = -31.7%
Formula
Percentage change = [(321 - 470) / 470] x 100
Subtract the new number by the original number
321 - 470 = -149
-149 ÷ 470 = -0.3170212765957447
-0.3170212765957447 x 100 = -31.7%