a significant trendp < 0.0001
solid green line), indicating that the variation in cigarette sales from 2014 to 2016 is well-explained by a significant trend component (annual decline of 0.02 packs per capita, p < 0.0001), and unemployment rate (each percentage point was associated with a decline of 0.02 packs per capita, p < 0.0001), but not GDP ( p = 0.485).