-77.61% is the change from 67 to 15
Calculation steps:
[( 15 - 67 ) ÷ 67] x 100 = -77.61%
Formula
Percentage change = [(15 - 67) / 67] x 100
Subtract the new number by the original number
15 - 67 = -52
-52 ÷ 67 = -0.7761194029850746
-0.7761194029850746 x 100 = -77.61%