Year	current US$
1995	3735078935.268954
1996	4018340166.434753
1997	4205274795.5656548
1998	4340421486.082708
1999	4387344216.939751
2000	4247662022.303283
2001	4734155161.830099
2002	5322167236.236124
2003	5142881640.751856
2004	6031648491.505244
2005	7513777623.588838
2006	8021432333.860603
2007	9763087319.674854
2008	12065707772.774082
2009	9582196321.844227
2010	11581176195.387455
2011	12340546624.61653
2012	13510401048.58088
2013	12864511810.887365
2014	14137362668.40336
2015	13057489940.03483
2016	12619153896.510582
2017	13876500783.649725
2018	14744006057.635168
2019	15877493950.980522