Year	current US$
1995	3245207693.02333
1996	3698483600.512112
1997	4658696819.639168
1998	4515385209.484979
1999	4419070800.200092
2000	5149249591.495064
2001	5054601671.745252
2002	4399114482.839643
2003	4530010542.068105
2004	5258641826.142685
2005	6309765518.10643
2006	7248016867.308968
2007	8767762339.486654
2008	9679811180.548197
2009	9107387156.54493
2010	10774269789.822046
2011	12983342783.862823
2012	15145049705.494879
2013	16406801251.361235
2014	15677162178.512
2015	13894528431.370605
2016	13821420418.145144
2017	16346581841.739141
2018	16316092613.683672
2019	14946037359.698898