Year	DOD, current US$
1971	509000
1972	1550000
1973	2773000
1974	5057000
1975	8030000
1976	11036000
1977	14995000
1978	18769000
1979	19206000
1980	20419000
1981	20392000
1982	20321000
1983	20192000
1984	20006000
1985	19801000
1986	19597000
1987	19393000
1988	19189000
1989	18985000
1990	18781000
1991	18521000
1992	18174000
1993	17711000
1994	17134000
1995	16521000
1996	15909000
1997	15296000
1998	14684000
1999	14071000
2000	13459000
2001	12846000
2002	12234000
2003	11621000
2004	11008000
2005	10396000
2006	9783000
2007	9170000
2008	8557000
2009	7945000
2010	7332000
2011	6720000
2012	6107000
2013	5495000
2014	4882000
2015	4269000
2016	3667000
2017	3044000
2018	2432000
2019	1820000
2020	1207000
2021	676000
2022	282000