Hello I am tried to get historical data on annual basis for major occupational group to analyze change in occupational structure.
In general you can find this information from two separate data sources. The IPUMS USA project provides access to public use microdata from the US Census and American Community Survey. These data go back to 1850, but before 2000 are only available every ten years. The IPUMS CPS project provides access to public use microdata from the Current Population Survey. These data go back to 1962 and are available on an annual basis. In both cases, you’ll like want to use one of the harmonized occupation variables. These variables are called OCC2010, OCC1990, or OCC1950 in both IPUMS USA and IPUMS CPS.