The provided chart illustrates the levels of water in reservoirs across six Australian cities in October in two consecutive years, 2009 and 2010.
Generally, it is conspicuous that the water levels in most of the cities revealed an overall rise, except for the fluctuation of city 4 and overall fall of city 1. In addition, city 6 had the highest level of water, as opposed to city 3.
Pertaining to the first three cities, city 1, 2 and 3, the figure for city 1 initially stood at around 45%, which was more than 15% higher than the corresponding category after a year. Meanwhile, the levels of water accounted for 75% in city 2, but only 25% in city 3, the lowest point during the time shown, in 2009 before increasing by roughly 10% each in 2010, making the former the highest figures in two given times.
Further examination of the other regions, more than 55% was experienced by the water level in city 4 and then plateaued during the period. Notably, at the outset, standing at 40% in city 5, the figure of the level in city 6 was more than two-fold than the former in the corresponding time. After a year, these figures witnessed an increase by about 20%, making the city 6 the zenith among those surveyed.