-42.16% is the change from 555 to 321
Calculation steps:
[( 321 - 555 ) ÷ 555] x 100 = -42.16%
Formula
Percentage change = [(321 - 555) / 555] x 100
Subtract the new number by the original number
321 - 555 = -234
-234 ÷ 555 = -0.42162162162162165
-0.42162162162162165 x 100 = -42.16%