The size of the market for foreign language instruction has seen a significant rise in the United States over the last decade. This is likely the result of the growing globalization of economic activity. The size listed here is the size of the revenues obtained by establishments primarily engaged in the teaching of foreign languages, including sign language.

Geographic reference: United States
Year: 1997 and 2007
Market size: $75.34 million and $857.96 million respectively
Source: “2007 Economic Census: Sector 61: Educational Services: Industrial Series: Preliminary Comparative Statistics for the United States 2007 and 2002,” July 31, 2009, available online here as well as the “1997 Economic Census” data on the same industry.
Original source: U.S. Bureau of the Census