the given bar chart illustrates the change of water levels across six cities namely Perth, Darwin,Canberra, Melbourne, Sydney, Brisbane in Australia between October 2009 and October 2010.
Overall, it is clear that the level of water in Brisbane was higher than other cities over the period, while the opposite was true for Perth and Melbourne. Additionally, during two years, there was a downward trend in Perth in 2010.
In 2009, the average reservation of water level in Brisbane reserved about 75%, this figure increased dramatically to 100% in 2010, which is the highest point in this graph. Darwin was the second city of reservoirs in two years remained stability and Canberra was peaked at 50% increased significantly by 23% in 2010.
In contrast, Perth witnessed a decreased trend through 51% in 2009, was about two times as much as that of water level in 2010. In Sydney, there was no change, stood at 49% during the period of two years, and there was a minimal increased from 35% to 45% in Melbourne.