I was wondering why so many variables are not available in 10% decennial census 2010 although they are available in 1990 and 2000 5% samples? For instance labor force participation, education, marital status etc.
Starting with the 2010 census, the Census Bureau did not administer the Long Form of the questionnaire. The American Community Survey (ACS) was designed to be a more frequently updated replacement of the census long form. You can find ACS data for 2010 from IPUMS USA. You can read more about the 2010 10% sample here: IPUMS USA | Sample Designs