-36.69% is the change from 507 to 321
Calculation steps:
[( 321 - 507 ) ÷ 507] x 100 = -36.69%
Formula
Percentage change = [(321 - 507) / 507] x 100
Subtract the new number by the original number
321 - 507 = -186
-186 ÷ 507 = -0.3668639053254438
-0.3668639053254438 x 100 = -36.69%