From 1973 though 2008, almost 500 US Peace Corps volunteers were based on the Islands, as many as 45 in a given year. Activities included assisting in the planning, design and construction of wells, libraries, and other infrastructure, and agricultural, environmental, and community health education. In 2006, volunteer placement was significantly scaled down due to the reduction of consistent air transportation to the outer islands; it was later ended because the associated ability to provide medical care to volunteers could not be assured. 