-71.7% is the change from 53 to 15
Calculation steps:
[( 15 - 53 ) ÷ 53] x 100 = -71.7%
Formula
Percentage change = [(15 - 53) / 53] x 100
Subtract the new number by the original number
15 - 53 = -38
-38 ÷ 53 = -0.7169811320754716
-0.7169811320754716 x 100 = -71.7%