-59.91% is the change from 646 to 259
Calculation steps:
[( 259 - 646 ) ÷ 646] x 100 = -59.91%
Formula
Percentage change = [(259 - 646) / 646] x 100
Subtract the new number by the original number
259 - 646 = -387
-387 ÷ 646 = -0.5990712074303406
-0.5990712074303406 x 100 = -59.91%