Year	US Dollars adjusted for inflation)
1981	2497286677.48283
1982	2705613731.30717
1983	2863460263.28829
1984	3033361371.57467
1985	3206653431.95156
1986	3507277015.23814
1987	3628581398.10905
1988	3813928331.23995
1989	3973281722.43507
1990	3846754148.22336
1991	3512334855.63911
1992	3187216784.29068
1993	3086220528.18135
1994	3152092285.02233
1995	3353083144.99786
1996	3428027699.94227
1997	3561608120.97173
1998	3680563574.14778
1999	3793570457.5362
2000	3837047132.18431
2001	3950344027.42331
2002	4137312959.549
2003	4427116613.5692
2004	4897515726.07987
2005	5252765131.74542
2006	5702204050.40528
2007	6286566854.31684
2008	6846094435.54697
2009	6759244954.07071
2010	7189481824.07288
2011	8432599135.69306
2012	9471480157.75525
2013	10574804943.2739
2014	11408652157.2819
2015	11680159346.4038
2016	11825367386.7456
2017	12521245862.6497