Today most of the 4,500-4,900 people live in Hanga Roa on the west coast. In the 16th & 17th century, there were approximately 15,000 people living on Easter Island scattered in agrarian clans or families. It is hypothesized that this population declined radically due to warfare and/or starvation, probably in response to limited resources. The foreigners who started arriving in 1722 introduced disease and later Peruvian slave traders came and captured some of the Rapa Nui, only 85 of whom returned. By 1877 there were only 112 Rapa Nui living on the island.