-16.4% is the change from 1000 to 836
Calculation steps:
[( 836 - 1000 ) ÷ 1000] x 100 = -16.4%
Formula
Percentage change = [(836 - 1000) / 1000] x 100
Subtract the new number by the original number
836 - 1000 = -164
-164 ÷ 1000 = -0.164
-0.164 x 100 = -16.4%