Era
1963-
38
1991-
20
21st century
17
20th century
16
Since 1991
15
1917-1936
14
1879-1940
11
1925-1997
11
1888-1938
10
1925-1988
10
1900-1999
9
Revolution, 1917-1921
9
1878-1952
7
1939-1945
7
1952-
7
1873-1920
6
19th century
6
2000-2099
6
1883-1936
5
1917-1921
5
1925-
5
1988-
5
1800-1899
4
1925-1984
4
1959-
4
1964-
4
1752-1800
3
1773-1775
3
1821-1881
3
1874-1934
3
1925-1953
3
1936-1937
3
1939 - 1945
3
1965-
3
Rebellion of Pugachev, 1773-1775
3
-1911
2
17th century
2
1828-1889
2
1829-1865
2
1840-1868
2
1860-
2
1874-1922
2
1879-1925
2
1885-1939
2
1890-1937
2
1892-1940
2
18th century
2
1900 - 1999
2
1904 - 1905
2
1904-1914
2
more ...