Maryland's leading industries by employment are health care and social assistance, state and local government, retail trade, and professional and technical services. Maryland's Gross State Product (GSP) was $295.4 billion in 2010. The Government sector produced $52.1 billion and accounted for 18 percent of Maryland's GSP in 2009. Federal government, including military and civilian, accounted for slightly more than half at just over $27 billion, while state and local government combined for nearly $25 billion. The Fort George G. Meade military installation, which includes employees of the National Security Agency, is the state's biggest employer at 44,540. The largest private sector industry is real estate with $48.4 billion, or 17 percent of economic activity. Large private employers in Ma