Year	constant 2015 US$
1977	10244967.713874673
1978	12322338.653016163
1979	14246908.227106968
1980	16928208.370972604
1981	20631822.409582127
1982	20631822.409582127
1983	21079312.12151628
1984	21926995.884773664
1985	22585497.005587343
1986	23487752.684934262
1987	24422751.513934895
1988	24939365.65291579
1989	25685181.839472715
1990	26456464.92020476
1991	25001213.824483924
1992	23502305.195891462
1993	22330828.063836195
1994	22778317.77577035
1995	21639583.793368798
1996	22512734.450801298
1997	23862479.84208237
1998	25175843.955970425
1999	26307301.682893377
2000	27093137.274582624
2001	27602475.158084914
2002	29072278.764762957
2003	29497939.710261296
2004	30916809.528589107
2005	32422994.41266017
2006	36450401.82006758
2007	39782926.829268284
2008	36148437.2177055
2009	39986661.982669204
2010	36461316.203285486
2011	37472715.71481147
2012	32284745.558566693
2013	37352657.499414496
2014	39044386.89818997
2015	40274074.074074075
2016	43093623.07203319
2017	45251032.821439326
2018	49100171.96962093
2019	49813245.00652413
2020	37858357.25517748
2021	39739269.29639666
2022	39215378.90193716
2023	39262674.562548086