-49.06% is the change from 159 to 81
Calculation steps:
[( 81 - 159 ) ÷ 159] x 100 = -49.06%
Formula
Percentage change = [(81 - 159) / 159] x 100
Subtract the new number by the original number
81 - 159 = -78
-78 ÷ 159 = -0.49056603773584906
-0.49056603773584906 x 100 = -49.06%