-68.88% is the change from 511 to 159
Calculation steps:
[( 159 - 511 ) ÷ 511] x 100 = -68.88%
Formula
Percentage change = [(159 - 511) / 511] x 100
Subtract the new number by the original number
159 - 511 = -352
-352 ÷ 511 = -0.6888454011741683
-0.6888454011741683 x 100 = -68.88%