The provided graph illustrates how many individuals in four age groups went to the gym at least once a month from 1990 to 2010.
Overall, there was a consistent rise in the proportion of European residents in all age groups, with a dramatic rise, notably, for the youngest group. The figures for the 35-44 and 44 and over age groups were much lower than those of the other groups.
Concerning the 18 to 24 age group, their figure stood at around 7% in the first surveyed year, after which this figure witnessed a potential surge to approximately 60% at the end of the period. A similar movement, but with a different level of intensity, occurred in the figure for the 25-34 age group, which saw a remarkable rise from around 8% to 50% during the same time.
Regarding the remaining groups, the percentage for those in the 35 to 44 age group began at just over 6% in 1990, before growing significantly to 40% in 2010. Meanwhile, a similar pattern was witnessed in the figure for the 45 and over age group, but to a lesser extent, starting at approximately 5% before rising slightly to roughly 25% during the same time frame.