The line graph illustrates data regarding individuals aged 65 and older who contracted the flu over a 10-year period, specifically from 1985 to 1995, in a British village.
Overall, it is evident that the number of cases increased from 1985 to the end of the period, peaking in 1991.
During the first five years, the number of flu cases rose by approximately 80%, from 40 cases in 1985 to 70 in 1990. In the initial two years, the figure steadily increased, reaching its first peak of nearly 55 cases in 1987. This was followed by a gradual decline of about 10 cases the following year. A slight recovery to around 48 cases by 1988 culminated in a significant rise to 70 cases in 1990.
In the subsequent five-year period, the data displayed some fluctuations. Between 1990 and 1991, the numbers climbed to their highest point of nearly 75 cases, nearly double the figure from 1985. Afterward, there was a decline to about 61 cases in 1992, followed by a final peak of around 64 cases in 1994. By the end of the 10-year span in 1995, there were 60 reported cases, reflecting an increase of 40 cases compared to a decade earlier.