-60.31% is the change from 645 to 256
Calculation steps:
[( 256 - 645 ) ÷ 645] x 100 = -60.31%
Formula
Percentage change = [(256 - 645) / 645] x 100
Subtract the new number by the original number
256 - 645 = -389
-389 ÷ 645 = -0.6031007751937985
-0.6031007751937985 x 100 = -60.31%