-37.45% is the change from 510 to 319
Calculation steps:
[( 319 - 510 ) ÷ 510] x 100 = -37.45%
Formula
Percentage change = [(319 - 510) / 510] x 100
Subtract the new number by the original number
319 - 510 = -191
-191 ÷ 510 = -0.37450980392156863
-0.37450980392156863 x 100 = -37.45%