Given its large sample size, the Census provides detailed data on place/geography, immigration status, visible minority status, and income as well as industry and occupation. It is also the best source for data by region and Census Metropolitan Area (CMA) in Canada. As well, the Census asks questions on unpaid work, a development that dates to 1996, when women's groups lobbied successfully to have questions on unpaid and volunteer work included in the survey. The Census is the primary source of data for the immigration module. The main drawback of the Census is its limited data on forms of employment.