-36.31% is the change from 504 to 321
Calculation steps:
[( 321 - 504 ) ÷ 504] x 100 = -36.31%
Formula
Percentage change = [(321 - 504) / 504] x 100
Subtract the new number by the original number
321 - 504 = -183
-183 ÷ 504 = -0.3630952380952381
-0.3630952380952381 x 100 = -36.31%