-68.64% is the change from 507 to 159
Calculation steps:
[( 159 - 507 ) ÷ 507] x 100 = -68.64%
Formula
Percentage change = [(159 - 507) / 507] x 100
Subtract the new number by the original number
159 - 507 = -348
-348 ÷ 507 = -0.6863905325443787
-0.6863905325443787 x 100 = -68.64%