-68.7% is the change from 508 to 159
Calculation steps:
[( 159 - 508 ) ÷ 508] x 100 = -68.7%
Formula
Percentage change = [(159 - 508) / 508] x 100
Subtract the new number by the original number
159 - 508 = -349
-349 ÷ 508 = -0.687007874015748
-0.687007874015748 x 100 = -68.7%