Year	DOD, current US$
1987	0
1988	1476232.9
1989	1469230.9
1990	2631921
1991	3237063.3
1992	3230000
1993	3422000
1994	4450000
1995	4795000
1996	4553000
1997	4287000
1998	4422000
1999	4302000
2000	4024000
2001	3810000
2002	4243000
2003	7383000
2004	8934000
2005	12611000
2006	16020000
2007	21121000
2008	21557000
2009	23169000
2010	23574000
2011	23332000
2012	23121000
2013	22865000
2014	25922000
2015	26469000
2016	29083000
2017	37220000
2018	39065000
2019	42897000
2020	44961000
2021	43603000
2022	40768000