Year	current US$
1995	3339974998.9364276
1996	3571597402.044898
1997	3705958449.735526
1998	3820265609.711135
1999	3904491938.114215
2000	4329634357.67262
2001	4028826041.9473333
2002	4069936511.763122
2003	5699314888.608422
2004	7650558163.2797785
2005	9160615908.220715
2006	10769940397.350996
2007	13217290286.97572
2008	14504000000
2009	13792000000
2010	17624000000
2011	21453000000
2012	21925000000
2013	23521000000.000004
2014	25942000000.000004
2015	27686000000.000004
2016	29574000000.000004
2017	35463000000.00001
2018	37491000000.00001
2019	39253000000.00001