The chart below shows waste collection by a recycling centre from 2011 to 2015

The bar chart provided depicts the waste collection by a recycling center over a period of 5 years from 2011 to 2015.
Overall, it is evident that waste collected from 4 materials witnessed an upward trend after a period surveyed.
As can be seen from the bar chart given, there was a plummet of the figure for paper from 2011 to 2013 and then it showed a surge to reach a peak of about 70 tons of waste in 2015.There was a negative correlation between the figure for paper and that of glass, in which the former crashed to almost 40 tons and the latter rose slightly to merely 48 tons to rank in the first in 2013. The figure for glass fluctuated dramatically before peaking at approximately 52 tons in 2015.
As far as the bar chart is concerned, waste from tins and garden were lower compared to the remaining figures. The data for tins witnessed some considerable fluctuations but it still remained under 40 tons of waste. The figure for garden always ranked in the fourth position which hit a bottom out at about 15 tons in 2012.