Year	current US$
1990	3194562621.89733
1991	3391377959.07392
1992	3595470596.60074
1993	3828713516.80099
1994	4102867890.25783
1995	4436022640.72224
1996	4788083721.75938
1997	5096795530.19364
1998	5625695031.14313
1999	5923688715.30141
2000	6300738941.52573
2001	6707780494.13106
2002	7121381385.54507
2003	7408721963.59212
2004	8070659612.286
2005	8610604983.45238
2006	9208437228.81601
2007	9934315466.89062
2008	10438270536.4879
2009	10916912713.2405
2010	11075212379.1341
2011	11525092340.0804
2012	12023176721.5549
2013	12292697767.5994
2014	12513063572.308
2015	13137170576.1985
2016	13825588932.9012
2017	14561235979.1685
2018	15164917363.0418
2019	15762276197.8049
2020	15908656720.7216
2021	16940636306.1258