Year	US Dollars
1990	8925111103.95537
1991	9216717679.67696
1992	9256118064.44822
1993	9499966343.13129
1994	10102610396.5911
1995	10749068204.7308
1996	11698770101.0776
1997	13117126725.1121
1998	14487858900.1391
1999	15854562336.6361
2000	16996867799.1395
2001	18422110664.3334
2002	20358253896.37789
2003	23588025455.083
2004	27007204536.6194
2005	29078386512.8261
2006	33807333115.9044
2007	36584222326.9602
2008	38594930984.57539
2009	36831302223.0944
2010	38696007666.0291
2011	36392191403.6683
2012	38970319156.739
2013	41235635325.08989
2014	41670598506.83369
2015	45204437439.06201
2016	42888648350.5332
2017	41787950466.90319