Year	PPG (DOD, current US$)
1971	41815506.2
1972	85158610.5
1973	222062210.8
1974	311995628.1
1975	351635332.8
1976	418670139.2
1977	542895908.1
1978	737667306.6
1979	947453119.4
1980	1454893287.5
1981	1813874808
1982	2146213611.6
1983	2492726305.3
1984	2585040023.8
1985	2968422310.1
1986	3440850696.5
1987	4060665975.3
1988	4395725505
1989	4645197520.5
1990	5162318822.8
1991	5257507398.1
1992	5255368393.5
1993	5363175373.6
1994	5487967242.9
1995	5561789325.7
1996	5659907260.4
1997	3477028747.8
1998	5277601398.5
1999	4271506364
2000	4109003207.7
2001	4351977023.2
2002	4571726624.8
2003	4816297928.6
2004	4882648206.6
2005	4814002394.9
2006	5098748866.4
2007	5524345612.8
2008	5695551276.9
2009	5875380196
2010	5944744525.7
2011	5887842504.5
2012	6942115606.1
2013	6924480065.5
2014	6861844490.7
2015	6476660913.3
2016	6322415766.8
2017	6316885577.2
2018	6205138005.7
2019	6188033657.6
2020	6251311659.2
2021	6107650687
2022	5895706365.7