Year	constant 2010 US$
1995	20297779171.4398
1996	19411849269.8662
1997	19552123169.7457
1998	20326210988.5699
1999	22307823203.918
2000	22908259639.9279
2001	25157286132.357
2002	26494674584.9767
2003	27081665728.7913
2004	26419467671.997
2005	26627820299.9901
2006	26570350476.6562
2007	27847016849.2472
2008	26139896767.7168
2009	25002356151.4443
2010	21662362958.5172
2011	20249268417.3403
2012	18740700487.7115
2013	18645459138.4243
2014	18254085884.1283
2015	17579727094.419
2016	18476498734.5916
2017	19028646919.8107
2018	19404186149.9622