The graph below shows the reported number of cases of influenza in people over 65 in a certain village in the UK from 1985 to 1995

The graph illustrates how many people from the age of 65 and above were reported to have contracted influenza in a particular village in the UK from 1985 to 1995.

Overall, the number of cases of elderly people with influenza increased over the period given. The highest number of people with the illness can be seen in 1991.

In 1985, the number of cases of influenza stood at 40 and then rose steadily over the next three years to reach 55 in 1987. In the following year, 1988, the figure dipped slightly to below 50 after which it rose significantly to reach a high of 75 in 1991.

From 1991, there was a decrease to about 60 in 1993 of the number of reported cases of influenza. From this point, except for a slight increase of about 5 cases, the number remained at about 60 at the end of the period.