Year	current US$
1990	4214277.72636426
1991	3440048.18476663
1992	3379199.30204233
1993	3938299.1590562
1994	4282608.40083539
1995	4894221.79555006
1996	5476479.64697411
1997	5863984.49065967
1998	5824923.13738285
1999	5516616.53548143
2000	5860192.08396212
2001	5454560.32233777
2002	5368699.63981645
2003	5358549.26234312
2004	5477548.84813503
2005	5684231.35900958
2006	15067208.6026031
2007	16001530.9371121
2008	17458666.7879379
2009	17577427.6081438
2010	18714936.404467
2011	19588142.4251641
2012	21416281.2840363
2013	21529790.7325311
2014	22136325.9072633
2015	23280301.1128891
2016	23488544.5880057
2017	23829042.9121608
2018	23023310.466125
2019	23872465.1858713
2020	19252692.0968446
2021	26415803.9435179