Year	current US$
1978	4431727.13746137
1979	4268580.37111558
1980	3668804.37258027
1981	3596451.39048495
1982	2731357.13561213
1983	2544715.1952973
1984	2179304.03524177
1985	1735961.00167889
1986	1711951.66760561
1987	2188656.09496429
1988	2652803.27807016
1989	2963318.83599557
1990	3136183.74834127
1991	4641530.76803241
1992	4716013.21974148
1993	4433790.76567388
1994	5144180.21640591
1995	5575223.64714603
1996	5662106.97237655
1997	6829247.43951311
1998	6983829.37554967
1999	6821964.51612905
2000	6667981.1572356
2001	6656742.52611976
2002	7055366.18493968
2003	8310740.64465921
2004	9114583.39461687
2005	9700695.60901107
2006	9429093.37349396
2007	11546920.7597691
2008	12525415.1987921
2009	11147309.9360474
2010	13894817.4646854
2011	15360800.4125838
2012	17530268.1714641
2013	18539630.2374976
2014	20512803.3171084
2015	21435466.9070693
2016	19407359.500446
2017	21914418.3016555
2018	22358933.8015541
2019	22745303.4410845
2020	20590470.0295919
2021	22939152.6442308