-11.53% is the change from 321 to 284
Calculation steps:
[( 284 - 321 ) ÷ 321] x 100 = -11.53%
Formula
Percentage change = [(284 - 321) / 321] x 100
Subtract the new number by the original number
284 - 321 = -37
-37 ÷ 321 = -0.11526479750778816
-0.11526479750778816 x 100 = -11.53%