-81.59% is the change from 929 to 171
Calculation steps:
[( 171 - 929 ) ÷ 929] x 100 = -81.59%
Formula
Percentage change = [(171 - 929) / 929] x 100
Subtract the new number by the original number
171 - 929 = -758
-758 ÷ 929 = -0.8159311087190527
-0.8159311087190527 x 100 = -81.59%