A bar chart represents the absolute or relative frequencies for different categories of a qualitative variable by means of bars. The lengths of the bars are proportional to the values that they represent. [..]

  The birth rate is the number of live births during a certain year as a proportion of the total population.

  observations belonging to a variable, i. e. to a characteristic whose value may vary.

  is the statistical study of all populations. It can be a very general science that can be applied to any kind of dynamic population, that is, one that changes over time or space.

  The mean number of children that would be born alive to a woman during her lifetime if she were to pass through her childbearing years conforming to the fertility rates by age of a given year. This rate is therefore the completed fertility of a hypothetical generation, computed by adding the fertility rates by age for wom [..]

  A histogram is a graphical tool that provides a rough approximation of the frequency distribution of a data set. The data belonging to a data set are grouped into intervals (bands, bins), usually intervals of equal size. The histogram presents the absolute or relative number of elelments of the data set belonging to the diff [..]

  The labour force or "currently active population" comprises all persons who fulfil the requirements for inclusion among the employed or the unemployed.

  Life Expectancy denotes the average lifespan of an individual.

  The mean number of years still to be lived by a person who has reached a certain exact age, if subjected throughout the rest of his or her life to the current mortality conditions (age-specific probabilities of dying).

  A line graph or time series graph represents a widely used graphical tool employed for visualizing data on quantitative variables that are observed at different points of time. The development of a stock market index during a trading day or the unemployment [..]