In the early to mid-1980s, international tourism arrivals in Colombia reached nearly 1.4 million per year. Although they decreased by more than half thereafter, they have recovered at rates of more than 10 percent annually since 2002, reaching 1.9 million visitors in 2006. Tourism usually has been considered a low-growth service industry in Colombia because of internal violence, but in 2006 the country earned US$2 billion from international tourism. Tourists visiting Colombia from abroad came mainly from the United States (24.5 percent), followed by Venezuela (13.4 percent), Ecuador (9.1 percent), Spain (6.4 percent), and Mexico (4.9 percent). Approximately 90 percent of foreign tourists arrive by air, 10 percent by land transportation, and a tiny share by sea.