[Table] The table below shows information about UK population between 1911 and 2011

The table below shows information about UK population between 1911 and 2011

The provided table illustrates how the UK population changed between 1911 and 2011, along with extra information about two other demographics, those aged 15 and 75. 

Overall, the two age brackets surveyed had a reciprocal relationship, as the percentage of citizens aged 15 decreased, the figure for seniors increased, and vice versa. Despite experiencing a downward trajectory in statistical terms, the number of male adolescents experienced an uptick, while that of females remained relatively stable.  

Total UK population registered an upturn over the 100-year period, exemplified by a consistent increase of 10 million people every 50 years, peaking at 56.1 million citizens in 2011. 

The percentage of teenagers aged 15 amounted to 1.86% of the population in 1911, and while this representation continually decreased over the surveyed period, hitting a trough at 1.23% one hundred years later, its numerical data followed a different trajectory. Specifically, the male figures saw marginal growth from 334,200 to 354,400 over the period, yet figures for the other gender hovered around the 330,000 range.  

In 1911, the proportion of senior citizens aged 75 comprised only 0.23% of the total population, and despite only having a 0.2% increase over the next 50 years, their figures were drastically different, with males numbering just 34,100, while females totaling 47,400. By 1961, both these numbers had witnessed historical jumps, with the former recording a four-fold increase, whereas the latter grew by five times. In the final year, this age group represented 0.70% of the entire British population, yet while male figures saw a slight increase by 20,000, that of females dropped by twice that amount.