The bar graph provides information regarding the proportion of various types of recycled household waste: the plastic, the paper, the glass and the cans, in a particular city, from 1992 to 2002. Overall, there was an increasing trend for all figures, albeit to different trajectories. Notably, glass was the dominant figure throughout the period, closely followed by paper. Although plastic remained as the lowest figure.
Focusing on dominant figures first, paper and glass started with almost identical percentages, at roughly 20%, after a decade, those figures increased dramatically, reaching almost a half for glass and approximately 40% for the paper.
As for the plastic and cans, their trajectories were opposite. As plastic began at one-tenth, grew minimally to 12% and levelled off until the 2002. However, the household waste “cans” started with well-above 15%. Then, that figure increased marginally to one-third in 2002, after falling to 15% in 1997.