The population density is the number of inhabitants for every km2, , The birth rate is the number of births in a place in one year for every 1000 inhabitants, , The mortality rate is the number of deaths in a place in one year for every 100 inhabitants, , In the old demographic model the birth rate and the mortality rate were high, , In the modern demographic model the birth rate and the mortality rate are low, , If there are more births than deaths the natural growth is positive, , If there are more deaths than births the natural growth is negative, , The infant mortality rate is the number of infants under one year old that die for every 1000 live births, , The fertility rate is the average number of babies per fertile woman, , Spain has got an ageing population. This means there are more older people and less young people, .

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