Era
20th century
23
1971-1981
15
21st century
15
1900-1999
11
1980-
9
1991-
9
1981-1993
8
2000-2099
7
2001-2009
7
1952-
5
Since 1991
5
1941-1979
4
1945-
4
1971-
4
1989-
4
1924-
3
1945-1989
3
1975-1985
3
1977-1981
3
1981-2001
3
1993-2001
3
19th century
3
Anthropocene
3
1865-
2
1913-1994
2
1913-2006
2
1976-
2
1984-
2
2000-
2
2001-
2
Since 1800
2
Since 1945
2
Since 1980
2
1883-1950
1
1899-1981
1
1911-1977
1
1918-1945
1
1926-
1
1933-1939
1
1933-1945
1
1935-
1
1942-
1
1946-
1
1949-
1
1950-
1
1951-
1
1960-1980
1
1961-
1
1961-1971
1
1969-1974
1
more ...