Year	current US$
1990	4119983.65681103
1991	4483238.72819108
1992	4688579.39199054
1993	5047928.46016611
1994	5271726.89161546
1995	5656242.25331597
1996	5889401.87178275
1997	6291318.17922229
1998	6676468.45032506
1999	6922892.92789412
2000	7239028.39061728
2001	7762736.36631299
2002	8262632.3200903
2003	8615281.9055557
2004	9486847.58254306
2005	10004486.0469342
2006	10545229.3729141
2007	11331429.1166471
2008	12345360.4765468
2009	14637262.0117074
2010	15718033.7674594
2011	17002180.4140832
2012	19263430.2431199
2013	19718485.9528623
2014	20539162.2253849
2015	22602331.4907937
2016	24778972.3699867
2017	26191964.5285145
2018	28600485.0667635
2019	31399768.2197968
2020	30278179.9658226
2021	33304301.2928096