Year	US Dollars
1990	157867095223.08798
1991	164192421450.22598
1992	171149939539.44003
1993	179980383345.88394
1994	194115567723.64001
1995	207953320542.047
1996	225905521476.24399
1997	245692451861.45493
1998	267292874648.73599
1999	278283776216.41003
2000	306061963781.26788
2001	324638825286.27399
2002	342984938890.78003
2003	365655777904.565
2004	400000181398.46704
2005	435245839480.86005
2006	469027709220.27814
2007	510208889481.53998
2008	543351517339.36102
2009	572386080181.27686
2010	619508201357.59888
2011	651365770268.03601
2012	711978752738.85291
2013	780932821269.90283
2014	841635476417.18225
2015	900689296512.06982
2016	970186200037.56421
2017	1052535404543.17017