-81.77% is the change from 938 to 171
Calculation steps:
[( 171 - 938 ) ÷ 938] x 100 = -81.77%
Formula
Percentage change = [(171 - 938) / 938] x 100
Subtract the new number by the original number
171 - 938 = -767
-767 ÷ 938 = -0.8176972281449894
-0.8176972281449894 x 100 = -81.77%