Era
1945-
12
21st century
8
2002-
3
20th century
3
1949-
2
1966-1998
2
1979-
2
1981-
2
1998-
2
2000-
2
1894-1971
1
1903-1990
1
1919-1952
1
1922-1976
1
1925-
1
1937-
1
1950-1966
1
1951-
1
1953-1985
1
1958-
1
1960-
1
1970-
1
1971-
1
1975-1990
1
1976-2002
1
1977-
1
1980-
1
1989-
1
1990-
1
1991-
1
1997-
1
20th century --
1
21st century --
1
To 221 BC
1
Warring States, 403-221 BC
1