For Mazowieckie voivodship a year 2015 was a consecutive one which recorded a population growth. Compared with 2014, as a result of positive net migration within internal migrations, the number of the voivodship’s residents went up by 12385 persons. Population growth was also a result of positive natural increase – in 2015, the number of live births was higher by 2426 than the number of deaths.

Labour Force Survey (LFS) is a sample-based survey, conducted by statistical interviewers, who visited the sample households, encouraged the members to take part in the survey and assisted in completing a form. A sample household represents many other households with similar features. Each answer counts, therefore the participants who took part in the survey are due to special thanks. Without their participation in a voluntary survey, it would not be possible to observe changes in the contemporary society.