The line graph illustrates the proportion of the population aged 18 to 34 in a certain country from 1978 to 2011, and the bar chart compares the geographical distribution of this age group across urban, town, and rural areas in 1978 and 2011.

Overall, the surveyed age group experienced a falling trend over the given period. With more people migrating to cities and towns, the changes in their demographic distribution reflected the broader trend of urbanization.

From the line graph, it is obvious that the share of 18-to-34-year-olds started at 35% in 1978. After a modest rise to a peak of 38%in 1992, this figure dropped significantly to just 30% in 2011.

In terms of the geological distributibution of this age group, we can see from the bar chart that in 1978, 55% of the people lived in cities, roughly twice the proportion in rural areas(25%) and towns(20%). By 2011, the percentages of people residing in urban areas and towns had both increased by 10%, while those living in rural areas had plunged to just 5%.

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