Table:
text: South Ossetia
Demographics
Demographics
Ethnicity _1926_census _1939_census _1959_census _1970_census _1979_census _1989_census _2007_estimate_
Ossetians 60,351 (69.1%) 72,266 (68.1%) 63,698 (65.8%) 66,073 (66.5%) 65,077 (66.4%) 65,200 (65.9%) 47,000 (67.1%)
Georgians 23,538 (26.9%) 27,525 (25.9%) 26,584 (27.5%) 28,125 (28.3%) 28,187 (28.8%) 28,700 (29.0%) 17,500 (25.0%)
Russians 157 (0.2%) 2,111 (2.0%) 2,380 (2.5%) 1,574 (1.6%) 2,046 (2.1%) 2,128 (2.1%) 2,100 (3.0%)
Armenians 1,374 (1.6%) 1,537 (1.4%) 1,555 (1.6%) 1,254 (1.3%) 953 (1.0%) 871 (0.9%) 900 (1.3%)
Jews 1,739 (2.0%) 1,979 (1.9%) 1,723 (1.8%) 1,485 (1.5%) 654 (0.7%) 648 (0.7%) 650 (0.9%)
Others 216 (0.2%) 700 (0.7%) 867 (0.9%) 910 (0.9%) 1,071 (1.1%) 1,453 (1.5%) 1,850 (2.6%)

Question: How many ethnic groups are there in South Ossetia?