Era
2009-
48
1981-2001
12
21st century
11
1981-1993
10
2001-2009
8
20th century
5
1993-2001
3
1933-
2
1952-
2
1981-
2
2000-2099
2
2009-2017
2
Since 1952
2
1743-1826
1
1757-1804
1
18th century
1
1931-
1
1945-
1
1945-1989
1
1950-
1
1975-1985
1
1976-2000
1
1981-1989
1
1989-1993
1
19th century
1
2001-
1
2008-2009
1
2021-
1
Appropriations and expenditures, 2016
1
Appropriations and expenditures, 2017
1
Appropriations and expenditures, 2018
1
Since 1900
1
Since 1945
1
To 1865
1