1897
1898
1899
19
190
1901
1902
1903
1906
1908
1909
191
1910
1911
1912
1913
1914
1919
192
1922
1924
1925
1926
1927
1928
193
1932
1933
1936
1937
1939
194
1940
1942
1943
1944
1945
1946
1947
1948
1949
195
1950
1951
1952
1953
1955
1956
1957
1959
UNESCO Atlas of the World’s Languages in Danger ID