Fig. 1
From: Socioeconomic factors influencing global paper and paperboard demand
Per capita paper and paperboard demand versus per capita GDP for target countries covering the period 1961–2014. Solid lines represent the regression models judged to have the best explanatory power (the quadratic model for newsprint paper, printing and writing paper, sanitary paper, and wrapping paper and corrugated cardboard; the linear model for other paper and paperboard). Adj. R 2 denotes the adjusted coefficient of determination