The bar chart illustrates the proportions of various types of domestic waste in one city from 1992 to 2002.
From an overall perspective, it is apparent that the percentages of glass, paper and plastic recycling showed an upward trend over the surveyed period, with glass and paper experiencing the most noticeable growth. In addition, the recycling rate of glass was consistently highest during the same period.
In 1992, the proportion of cans recycled was highest, at just under one-fifth. The figures for glass and paper were lower, at around 16% and 15%, respectively. However, the recycling of plastic accounted for the lowest percentage, at precisely 10%.
Between 1992 and 2002, the proportion of plastic recycled experienced a slight rise to about 12% before remaining stable in the last year of the period, remaining at its lowest rate of waste recycled. The data on paper witnessed a significant increase to nearly 28% in 1997, then rocketed to approximately 39% in 2002. Likewise, the figure for glass witnessed the same surge, soaring to over one-third in 1997 before reaching its peak of just under 50%. Additionally, the percentage of cans recycling fluctuated marginally, rising to roughly 30% in the last year after declining to 15% in 1997.