Era
1981-2001
58
1945-
39
1918-1945
24
1971-1981
24
21st century
22
20th century
21
2009-
17
1981-1993
14
1980-2020
13
2001-2009
11
To 1865
11
1865-1918
9
1929
7
1993-2001
6
1981-1989
4
1960-1980
3
1981-
3
1989-
3
18th century
2
1919-1933
2
1945-1960
2
1945-1989
2
1961-1971
2
19th century
2
1743-1826
1
1757-1804
1
1763-1848
1
17th century
1
1841-1915
1
1858-1946
1
1865-1898
1
1868-1932
1
1901-1945
1
1913-1921
1
1918-
1
1918-1932
1
1926-
1
1933-1945
1
1945-1966
1
1969-1974
1
1970-
1
1971-
1
1983 November 26-
1
1989-1993
1
1990-
1
1993-
1
2000-
1
Colonial period, ca. 1600-1775
1
Condiciones económicas, 1918 ****
1