Before the late 1990 s, people bought air tickets from a travel agent. When airline deregulation in the late 1970 s led U.S. air travel to more than triple between 1975 and 2000 , the number of travel agents grew from 45,000 to 124,000 . In the late $1990 \mathrm{~s}$, internet travel sites such as Travelocity, Expedia, Priceline, and Orbitz entered the market. As a result, travel agents began to disappear. Of those travel agents working in $2000,10 \%$ left in 2001, another $6 \%$ in 2002, and $43 \%$ by 2010 (Waldfogel, 2012). Use figures to explain what happened in the market for travel agents.