The bar chart illustrates the proportion of various domestic waste in one city from 1992 to 2002. Overall, it is clear that the percentage of glass, paper, and plastic witnessed an upward trend over the surveyed period, while glass and paper experienced the most noticeable growth.
In 1992, the rate of paper recycled was the highest rate at 25%, while the lowest rate of waste recycled was for plastic at 10%. However, the figures for cans and paper were about 19% and 17% respectively.
Between 1997 and 2002, the percentage of glass recycled surged from around 28% to 48% in 2002. The figures for paper also increased to approximately 38%, which was 10% more than last decade. The rate of cans recycled decreased to 12% in 1992 and was followed by significant growth in 2002 reaching 25%. The percentage of plastic recycled went up to 12% and then remained unchanged until the end of the period.