Era
1945-
537
20th century
242
19th century
127
21st century
125
1918-1945
94
1960-
89
1989-
83
1991-
58
2000-
56
1976-
47
18th century
45
1990-
40
1947-
35
1981-
32
1918-
30
1982-
29
1949-
28
1997-
26
1979-
25
1971-
24
1980-
21
1975-
20
To 1865
20
1918-1933
17
1976-2000
17
1760-1860
15
1933-1945
15
2002-
15
1945-1989
14
1970-
14
1981-2001
13
1994-
13
17th century
12
1945-1990
12
1964-
12
1993-
11
Unification, 1990
11
1961-
10
1929
9
1945-1964
9
2001-2009
9
1837-1901
8
1868-
8
1959-
8
1973-
8
2007-
8
1865-1918
7
1974-
7
1995-
7
1789-1900
6
more ...