-78.87% is the change from 71 to 15
Calculation steps:
[( 15 - 71 ) ÷ 71] x 100 = -78.87%
Formula
Percentage change = [(15 - 71) / 71] x 100
Subtract the new number by the original number
15 - 71 = -56
-56 ÷ 71 = -0.7887323943661971
-0.7887323943661971 x 100 = -78.87%