The graph illustrates the reported number of influenza cases among individuals aged over 65 in a particular village in the United Kingdom between 1985 and 1995.
Overall, the number of cases experienced noticeable fluctuations throughout the period, showing a general upward trend with a significant peak in 1990, followed by a period of instability and a return to earlier levels by 1995.
In 1985, the number of cases was around 40. This figure rose steadily to approximately 55 in 1987. A slight decline occurred in 1988, when the cases dropped to about 45. From there, the number increased sharply, reaching a peak of roughly 75 in 1990, which was the highest figure during the entire period observed.
Following this peak, there was a substantial decline to nearly 60 cases in 1991. The years that followed displayed unstable behavior, with minor fluctuations throughout. Despite these variations, the number of reported cases eventually returned to around 60 by the end of the period.
In conclusion, the overall trend reflected both growth and irregular variation in flu cases among the elderly.