Year	constant 2010 US$
1989	6452.82083151911
1990	6318.68270019831
1991	5957.98556037874
1992	5314.23172933925
1993	5006.37670658929
1994	4475.83821105426
1995	4413.83881676577
1996	4408.2829726569
1997	4522.94468078738
1998	4444.65921728857
1999	4536.40518837862
2000	4898.70912115412
2001	5029.64320572123
2002	5309.7612676852
2003	5660.12537869204
2004	6129.70855969143
2005	6564.08990446018
2006	7094.12464560086
2007	7625.93949501893
2008	7940.9752982654
2009	7435.42899456762
2010	7773.1697146638
2011	8196.99694317453
2012	8452.83728470202
2013	8739.51827486761
2014	8879.66345415844
2015	8896.45063555085
2016	8996.4268712055
2017	9305.89111655888
2018	9515.6827992836