Population: Solve this crossword puzzle

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Across
  1. 7. difference between immigration and emigration
  2. 9. study of human population
  3. 10. Movement of people into a country
  4. 11. extreme scarcity of food which affects death rate of a country
  5. 12. number of people in an area
  6. 13. counting population
Down
  1. 1. Anual recorded deaths per 1000 of population
  2. 2. the total population of a country who are employed and looking for employment.
  3. 3. movement of people from one place to another
  4. 4. an event causing great and often sudden damage or distress; a disaster
  5. 5. people who moved out of a country
  6. 6. Crude birthrate
  7. 8. Economic state of a country/region