-19.31% is the change from 321 to 259
Calculation steps:
[( 259 - 321 ) ÷ 321] x 100 = -19.31%
Formula
Percentage change = [(259 - 321) / 321] x 100
Subtract the new number by the original number
259 - 321 = -62
-62 ÷ 321 = -0.19314641744548286
-0.19314641744548286 x 100 = -19.31%