The line graph describes data about those aged 65 and above who had flu over a 10-year period between 1985 and 1995 in a British village.
Overall, it can be clearly seen that the quantity of cases had grown from 1985 to the final year with the highest number of sick people reported in 1991.
During the first 5-year period, the number of cases climbed by around 80%: from 40 in 1985 to 70 in 1990. Over the first 2 years, the figure was constantly growing to its first peak at nearly 55 in 1987, which was followed by a gradual drop by approximately 10 cases one year later. Further marginal growth to roughly 48 by 1988 ended up with a dramatic jump to 70 cases in 1990.
For the following 5-year period, the figure experienced some fluctuation. Between 1990 and 1991, the trajectory was inclining to its highest point at nearly 75 cases, which was almost 2 times more than in 1985. Followed by a decline to about 61 cases in 1992, there was a last peak at about 64 reported cases in 1994. By the final year, 60 people had influenza, which was by 40 cases more than 10 years before.