-33.2% is the change from 1000 to 668
Calculation steps:
[( 668 - 1000 ) ÷ 1000] x 100 = -33.2%
Formula
Percentage change = [(668 - 1000) / 1000] x 100
Subtract the new number by the original number
668 - 1000 = -332
-332 ÷ 1000 = -0.332
-0.332 x 100 = -33.2%