Era
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2000-
16
2001-
16
1861-1865
15
1971-1981
15
1981-
15
1986-
15
1988-
15
Since 1979
15
Since 1986
15
1945-1989
14
1950-1953
14
1959-
14
1990
14
2001-2021
14
2009
14
Since 1980
14
1933-1945
13
1980-
13
1949-
12
1975-
12
1997-
12
2001-2011
12
War of 1812
12
1990-
11
2002-
11
Since 1988
11
1940
10
1952-
10
1991-2003
10
2001 - 2009
10
2003
10
Since 1960
10
Since 1997
10
1700-1799
9
1946-
9
1951-
9
1999
9
Since 1959
9
Since 1990
9
Since 2002
9
1700-1899
8
1945-1953
8
1961 - 1975
8
1980
8
1981 - 2001
8
1981-1993
8
1992-
8
2010
8
Since 1975
8
Vietnam War, 1961-1975
8
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