-19.63% is the change from 321 to 258
Calculation steps:
[( 258 - 321 ) ÷ 321] x 100 = -19.63%
Formula
Percentage change = [(258 - 321) / 321] x 100
Subtract the new number by the original number
258 - 321 = -63
-63 ÷ 321 = -0.19626168224299065
-0.19626168224299065 x 100 = -19.63%