Year	constant 2010 US$
1991	8810.49028131039
1992	8718.91002615835
1993	8772.21372209329
1994	8869.35635049028
1995	8969.52948200365
1996	8919.8373964493
1997	9003.5818739055
1998	8790.23785553501
1999	8430.28272031564
2000	8044.49305453323
2001	7757.21163972036
2002	7528.94666896509
2003	7114.37521282348
2004	7171.30991740811
2005	7040.61432169911
2006	7485.65925431701
2007	7584.82224089498
2008	7394.45849115826
2009	7614.57389348236
2010	8104.59729031117
2011	7955.74832033208
2012	7671.6457960428
2013	7580.84438995811
2014	8149.57446942589
2015	7996.50317653083
2016	8216.71184519567
2017	8352.40543395824
2018	8565.6354627069