60 percent certain, based on the evidence available
13,000 speakers on Sumba Island. The number of speakers provided here does not include speakers living in places other than Sumba Island. (2008 Population Registration)
MORE ON VITALITY
Threatened. The rate of population growth was 1.88 percent per annum during 1990-2000 periods. This condition decreased compared to the previous period. In the period of 1980-1990 the average percentage of population growth was 2.10 percent per annum. (I Wayan Arka, personal communication, November 2013)
Sumba Island in Eastern Indonesia; mid-westerly part of the island; inland.
Information from: “Ethnologue: Languages of the World, 18th Edition” . Lewis, M. Paul, Gary F. Simons, and Charles D. Fennig · SIL International
20 percent certain, based on the evidence available
DATE OF INFO
"Nusa Tenggara Timur Province; northwest Sumba island, coastal area, Memboro town."