Era
20th century
144
19th century
80
18th century
20
1919-1972
16
1918-2002
12
1895-1948
11
1931-1995
11
1925-2015
10
1945-
10
1877-1927
8
1914-1999
8
21st century
8
To 1500
8
17th century
7
1872-1929
7
1901-1978
7
1928-1989
7
1728-1779
6
1881-1965
6
1890-1950
6
1906-1982
6
16th century
5
1810-1891
5
1886-1961
5
1903-1941
5
1914-1981
5
1930-2010
5
1935-2020
5
1941-
5
1943-
5
1956-
5
1958-
5
1960-
5
1966-
5
Medieval, 500-1500
5
1820-1892
4
1874-1926
4
1878-1946
4
1879-1958
4
1887-1953
4
1910-1974
4
1931-
4
1934-2021
4
1935-2019
4
1940-
4
1948-
4
1951-
4
1971-
4
Holocene
4
Quaternary
4
more ...