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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