The line graph reveals the percentage of four recycled materials namely paper and cardboard, glass containers, aluminum cans and plastic over a period of 28 years, starting from 1982.
Overall, it can be seen that the proportion of paper and cardboard which was recycled declined with some fluctuations, but it was the highest figure at the end of the period shown. The rate of recycled glass containers experienced a fluctuate trend of increase, while the percentage of aluminum cans and plastic steadily rise throughout the time period.
Starting from 65% in 1982, the rate of paper and cardboard which experienced recycling process rise to 70% in 1986, after which it declined back to 65% in 1990. Then, the figure for recycled paper and cardboard reached the peak of 80% in 1994, followed by a gradual decrease to 70% at the end of the period. The percentage of aluminum cans which was recycled rise steadily from 5% in 1982 to 45% in 2010.
The proportion of recycled glass containers decreased about 10% in 1990, starting from 50%. After that, it saw a rapidly growth from 50% in 1994 to 60% at the end of the period examined. The percentage of recycled plastics rose negligibly by approximately 4% in 2010, starting from only 5% in 1990.