The line graph depicts the proportion of four various materials (paper & cardboard, glass containers, aluminium cans, and plastics) were recycled from 1982 to 2010 in a country.
Overall, the numbers of the recycled materials increased in all four categorize during the period.
Initially, the figures for paper & cardboard and glass containers stood at 65% and 50% respectively in 1982. Over the next 8 years, the rate of paper materials increased then returned to initial level , by contrast the indicator of glass containers decreased to 40%. Then both of them increased from1990 to 1994. After that the gap narrowed, and indicator of glass continued increased, compared to paper declined, and they finished the period at 60% and 70% in turn.
In 1986, the collecting of aluminium cans started, and the rates of aluminium’s collecting was almost 5 %. 4 years later, the process of collecting plastics started, and it only contributed 3 % in 1990. The rates of aluminium rapidly raised during the whole period , and finished the period at 45 %, while the indicator of plastics gradually increased and reached 8% at the end of the period.