-68.76% is the change from 509 to 159
Calculation steps:
[( 159 - 509 ) ÷ 509] x 100 = -68.76%
Formula
Percentage change = [(159 - 509) / 509] x 100
Subtract the new number by the original number
159 - 509 = -350
-350 ÷ 509 = -0.68762278978389
-0.68762278978389 x 100 = -68.76%