-76.39% is the change from 936 to 221
Calculation steps:
[( 221 - 936 ) ÷ 936] x 100 = -76.39%
Formula
Percentage change = [(221 - 936) / 936] x 100
Subtract the new number by the original number
221 - 936 = -715
-715 ÷ 936 = -0.7638888888888888
-0.7638888888888888 x 100 = -76.39%