The given bar chart illustrates the quantity of waste collected by a recycling agency between 2011 and 2015, broken down by four different types of waste.
Overall, paper was the dominant source of waste in most years, except for 2013 while garden waste consistently claimed the lowest spot throughout. It is also obvious that the amount of waste from all sources increased over time, albeit at varying degrees.
Paper and glass waste were the ones that contributed the largest shares across the timeframe. In the first two years, despite witnessing a slight decline, the former outnumbered its counterparts, registering 57 tons in 2011 and 50 tons in 2012. This trajectory was followed in 2013 when glass waste surpassed it and became the most frequently collected waste (at 48 tons). However, this was just a short-lived increase as the figure for glass decreased subsequently to 46 tons. Meanwhile, paper recovered its growth and hit its peak at 70 in 2015, being the highest point in the chart.
As for less commonly gathered waste, only 35 tons of tins were collected initially. This figure then fluctuated mildly around 30 tons before ascending to 39 tons in 2015. Having a similar unstable pattern, the amount of garden waste almost halved from 32 tons in 2011 to 15 tons in 2012. After hovering around 30 tons in the next two years, it displayed an uptick to 35 tons in 2015, securing its position as the least collected waste throughout.