This is from 2008, but I find it very interesting.
Numbering almost two million, artists are one of the largest classes of workers in the nation, only slightly smaller than the U.S. military’s active-duty and reserve personnel (2.2 million). Artists now represent 1.4 percent of the U.S. labor force. While Artists in the Workforce is not an economic impact study, it does report the average income of various artist categories. Based on those statistics, artists earn an aggregate income of approximately $70 billion annually. The study compares artists with the labor force in general, reporting on factors such as geographic distribution, racial, ethnic, and gender composition, employment status, age, and education level.