Year	current US$
1970	1498.2764367816094
1971	1874.2953019009926
1972	2196.7142401919755
1973	2860.2805764011528
1974	3432.706032912763
1975	4257.875611484055
1976	4844.656293474845
1977	5713.962533605535
1978	7235.516939343295
1979	8480.762531058217
1980	9483.102405851982
1981	8544.097910165125
1982	7813.651282121718
1983	7988.177946629883
1984	7198.707808166498
1985	7760.834263706284
1986	11271.332573588381
1987	14554.351366973553
1988	16397.950193876142
1989	16813.74145011074
1990	18326.929502325158
1991	18315.31656319062
1992	18768.827532545478
1993	16797.35782188279
1994	18124.099807576335
1995	21665.829517311555
1996	21422.46098536716
1997	19145.614890096003
1998	20496.57878355897
1999	20170.322763798027
2000	19004.003843569793
2001	19275.433965955574
2002	20652.841704244292
2003	27459.87532954613
2004	32023.682051613654
2005	32489.72773098986
2006	35458.2542977474
2007	39780.944136872095
2008	44366.78586881754
2009	44918.84138321552
2010	43988.52802904937
2011	47186.875996938776
2012	45936.95628177236
2013	47535.48837923765
2014	50485.22441352912
2015	44536.35497053773
2016	48181.74535412656
2017	50765.74946653718
2018	54545.13585776503
2019	53309.20359050652
2020	54693.07668042647
2021	57116.29577072201