Era
1945-
9
1951-
7
20th century
7
1800-1837
6
1917-1921
6
1945-1991
6
Revolution, 1917-1921
6
1900-1999
5
1918-1945
5
1979-
5
Since 1979
5
1975-
4
Since 1945
4
1917-1945
3
1933-1945
3
1945-1989
3
1980-
3
Since 1918
3
1760-1789
2
1800-1945
2
18th century
2
1900-1945
2
1918-
2
1918-1938
2
1931-1939
2
1939-1975
2
1944-1989 (Polska Ludowa)
2
1945-1980
2
1945-1992
2
1953-1985
2
1955-
2
1979-1992
2
1989-
2
1993-
2
19th century
2
Revolution, 1775-1783
2
Since 1931
2
Since 1955
2
Since 1975
2
1723-1791
1
1727-1760
1
1733-1804
1
1775-1783
1
1809-1817
1
1825-1829
1
1837-1901
1
1861-1865
1
1865-
1
1865-1950
1
1871-1918
1
more ...