-52.23% is the change from 672 to 321
Calculation steps:
[( 321 - 672 ) ÷ 672] x 100 = -52.23%
Formula
Percentage change = [(321 - 672) / 672] x 100
Subtract the new number by the original number
321 - 672 = -351
-351 ÷ 672 = -0.5223214285714286
-0.5223214285714286 x 100 = -52.23%