Year	current US$
1990	23629318.0317103
1991	24465674.2024142
1992	25988125.7727476
1993	27763606.5309136
1994	30605303.3429897
1995	30574282.4503566
1996	36132276.348505
1997	35595616.0140208
1998	36806172.226151
1999	37632135.9157322
2000	41392393.1053244
2001	41918776.3780902
2002	45142186.9201022
2003	46858729.2226649
2004	51184849.7490279
2005	53279702.9877963
2006	57140426.1061686
2007	61292733.5012103
2008	58506274.2930418
2009	58272873.5403644
2010	56013356.5746992
2011	56375651.1274197
2012	57790290.7293594
2013	65620532.7564768
2014	69025050.1561378
2015	71632005.0547067
2016	58535833.3108455
2017	62486543.4049711
2018	66603869.4615172
2019	66877429.4894484
2020	60886082.704875
2021	64077670.2731768