-98.4% is the change from 936 to 15
Calculation steps:
[( 15 - 936 ) ÷ 936] x 100 = -98.4%
Formula
Percentage change = [(15 - 936) / 936] x 100
Subtract the new number by the original number
15 - 936 = -921
-921 ÷ 936 = -0.9839743589743589
-0.9839743589743589 x 100 = -98.4%