-13.4% is the change from 1000 to 866
Calculation steps:
[( 866 - 1000 ) ÷ 1000] x 100 = -13.4%
Formula
Percentage change = [(866 - 1000) / 1000] x 100
Subtract the new number by the original number
866 - 1000 = -134
-134 ÷ 1000 = -0.134
-0.134 x 100 = -13.4%