Portugal Statistic Office is now using 2011 census for unemployment data. (Starting from 2011)Portugal Statistics Institute has adopted a new methodology for calculations of Labour Force Survey from 1st quarter 2011. This new methodology includes: a new data collection mode associated to the use of telephone interviews, a change in the questionnaire, and the adoption of new field work supervision technologies. In view of these changes, the results released for the 1st quarter of 2011 are not directly comparable with the results published for the previous quarters, entailing a series break.The unemployment rate is calculated by INE using the results of the Quarterly National Labor Force survey in conjunction with total population data from the most recent census. Data is not seasonally adjusted.