The bar chart illustrates the proportion of four different kinds of waste material in household recycled in a city (plastic, cans, paper, and glass) from 1992 to 2002.
Overall, it is clear that all of materials waste recycled increased during the period, except for cans. Additionally, paper and glass were two materials that increased the most, and plastic waste was the lowest portion for 10 years.
In 1992, the percentage of cans waste was the highest figure, approximately 18%. While the opposite was true for plastic, at only 10%. Remaining waste recycled materials were stood at nearly same portion, paper at about 13% and glass at about 15%.
By the end of the period, the percentage of plastic was at the same portion in 1997, above 10%, it remained at thr same level, also lower than other materials. Waste recycled material of cans dropped by about 6%, approximately 12%in 1997 before climbed to nearly 16% at the end. The point that at thr second rank was in paper material, which was rise remarkableto approximately 38%, rose about more three times than figure at the begin. Similarly, glass in 2002 was experienced a trend similar paper, reach a peak under 50%, after saw a nearly double increased about 28% in 1997.