-82.9% is the change from 1000 to 171
Calculation steps:
[( 171 - 1000 ) ÷ 1000] x 100 = -82.9%
Formula
Percentage change = [(171 - 1000) / 1000] x 100
Subtract the new number by the original number
171 - 1000 = -829
-829 ÷ 1000 = -0.829
-0.829 x 100 = -82.9%