-5.61% is the change from 321 to 303
Calculation steps:
[( 303 - 321 ) ÷ 321] x 100 = -5.61%
Formula
Percentage change = [(303 - 321) / 321] x 100
Subtract the new number by the original number
303 - 321 = -18
-18 ÷ 321 = -0.056074766355140186
-0.056074766355140186 x 100 = -5.61%